Explanation
The correct answer is D. The greatest number of civilian home fire deaths can be attributed to the common room, living room, or family room area of origin in the home. According to a report by the NFPA, based on data from the National Fire Incident Reporting System (NFIRS) and NFPA's fire experience survey, 31 percent of the civilian home fire deaths in 2017-2021 occurred in fires that started in the common room, living room, or family room. This was followed by 29 percent of the deaths in fires that started in the bedroom or sleeping area, and 12 percent of the deaths in fires that started in the kitchen or cooking area. The common room, living room, or family room area of origin is also the leading area of origin for home fires and civilian home fire injuries, accounting for 24 percent and 21 percent of those incidents, respectively. Some of the common causes of fires in the common room, living room, or family room include smoking materials, heating equipment, electrical equipment, candles, and fireplaces. To prevent fires and fire deaths in the common room, living room, or family room, the NFPA recommends the following safety tips:
Keep smoking materials away from anything that can burn. Use deep, sturdy ashtrays and wet cigarette butts before discarding them.
Keep space heaters at least 3 feet away from anything that can burn. Turn them off when you leave the room or go to sleep.
Have a qualified electrician inspect and repair any faulty wiring or outlets. Avoid overloading circuits or extension cords. Unplug appliances when not in use.
Keep candles in sturdy holders and away from children, pets, and anything that can burn. Blow them out when you leave the room or go to sleep.
Have your chimney and fireplace cleaned and inspected annually by a professional. Use a metal or glass screen to keep sparks from flying out. Dispose ofashes in a metal container with a lid, and keep it outside at least 10 feet away from your home.
Install smoke alarms on every level of your home, inside each bedroom, and outside each sleeping area.
Test them monthly and replace the batteries at least once a year. Consider installing a home fire sprinkler system for added protection.

Explanation
A Class I standpipe system provides 2 1/2 in. (65 mm) hose connections at designated locations in a building for use by the fire department. A Class I standpipe system is intended to supply water for fire fighting operations by trained personnel using hoses of 1 1/2 in. (40 mm), 1 3/4 in. (45 mm), or 2 in. (50 mm) nominal diameters. A Class I standpipe system is required to deliver a minimum flow rate of 250 gpm (946 L/min) at a minimum residual pressure of 100 psi (6.9 bar) at the most remote hose connection.References:
NFPA 14: Standard for the Installation of Standpipe and Hose Systems, 2019 Edition, Section 3.3.4.11 Fire Protection Handbook, 20th Edition, Volume 1, Chapter 8, Section 8.2.1.12

Explanation

Smoke detector
Explore
Detectors using the photoelectric principle do not use a small amount of radioactive material. This is a false statement about smoke detectors. Detectors using the photoelectric principle use a light source and a light sensor to detect the presence of smoke. When smoke enters the detection chamber, it scatters the light and triggers the alarm.Detectors using the photoelectric principle are more responsive to low-energy (smoldering) fires that produce large smoke particles12.
Detectors using the cloud chamber principle also use the photoelectric principle. This is a true statement about smoke detectors. Detectors using the cloud chamber principle usea sealed chamber that contains a supersaturated vapor. When smoke enters the chamber, it causes the vapor to condense into droplets that reflect light. The light is then detected by a photoelectric sensor that activates the alarm.Detectors using the cloud chamber principle are very sensitive to small smoke particles34.
Detectors using the ionization principle provide somewhat faster response to high-energy (open flaming) fires.
This is a true statement about smoke detectors. Detectors using the ionization principle use a small amount of radioactive material that ionizes the air in the detection chamber. When smoke enters the chamber, it reduces the ionization and the electric current. The drop in current is then detected by a circuit that activates the alarm.Detectors using the ionization principle are more responsive to high-energy (open flaming) fires that produce small smoke particles12.
Detectors using the photoelectric principle provide somewhat faster response to low-energy (smoldering) fires.
This is a true statement about smoke detectors. Detectors using the photoelectric principle use a light source and a light sensor to detect the presence of smoke. When smoke enters the detection chamber, it scatters the light and triggers the alarm.Detectors using the photoelectric principle are more responsive to low-energy (smoldering) fires that produce large smoke particles12.