According to the LEED v4: Building Design + Construction Guide, the Sustainable Sites Credit, Open Space requires the project to provide outdoor space greater than or equal to 30% of the total site area (including building footprint). At least 25% of that outdoor space must be vegetated, have overhead vegetated canopy, or be a water body. Option A does not qualify as outdoor space, Option B is not vegetated or a water body, and Option C only applies to projects with a FAR of less than 1.0. Option D meets the requirements for both outdoor space and vegetation, and also contributes to the protection or restoration of habitat1. References:
LEED v4: Building Design + Construction Guide, Sustainable Sites Credit, Open Space, Requirements1

Using a non-native or non-adapted plant species on both the vegetated roof and ground level will impact the Sustainable Sites credit Site Development-Protect or Restore Habitat the most. This credit requires that at least 20% of the site area (excluding building footprint) or 5% of the site area (including building footprint) must be vegetated with native or adapted plants. Non-native or non-adapted plants do not qualify for this credit and may also have negative impacts on the local ecosystem and biodiversity. The other credits are not directly affected by the choice of plant species, although they may have other requirements related to vegetation, such as shading, reflectance, or lighting.

According to the LEED v4: Building Design + Construction Guide, the location of CO2 sensors in naturally ventilated spaces to comply with the Indoor Environmental Quality Prerequisite, Minimum Indoor Air Quality Performance is between 3 ft. and 6 ft. (1 m and 2 m) above the floor. This is one of the requirements for Option 2. Naturally Ventilated Spaces, which applies to projects that rely on natural ventilation for all or part of the occupied spaces. The CO2 sensors must be located in each zone with natural ventilation openings, and must be capable of generating an alarm when the CO2 concentration exceeds the design value1.
The other choices are not correct, because:
* At least 6 ft. (2 m) above the floor is the location of CO2 sensors in mechanically ventilated spaces, not naturally ventilated spaces1.
* At least 3 ft. (1 m) away from windows is a general guideline for locating CO2 sensors, but it does not specify the height above the floor2.
* On the ceiling 3 ft. (1 m) away from adjacent walls is not a recommended location for CO2 sensors, as it may not reflect the actual CO2 concentration at the breathing zone of the occupants2.

Selecting a high-reflectance interior paint that meets the SCAQMD Rule 1113 can help contribute towards two credits: Indoor Environmental Quality Credit, Low-Emitting Materials and Indoor Environmental Quality Credit, Interior Lighting. The first credit requires that interior paints and coatings comply with the VOC content limits specified by the SCAQMD Rule 1113 or equivalent standards to reduce indoor air contaminants that are odorous, irritating, and/or harmful to the comfort and well-being of installers and occupants1 The second credit aims to provide high-quality lighting that supports visual acuity and occupant comfort, and that responds to the needs of the space and its users. One of the strategies to achieve this credit is to use light- colored finishes with a minimum reflectance of 0.7 for ceilings, 0.5 for walls, and 0.2 for floors to increase the effectiveness of daylighting and electric lighting systems2 References: 1: LEED v4 Reference Guide for Building Design and Construction, Indoor Environmental Quality Credit: Low-Emitting Materials, page 692.
2: LEED v4 Reference Guide for Building Design and Construction, Indoor Environmental Quality Credit:
Interior Lighting, page 715.

When calculating the reverberation time of a room, the operating sound level of the nearest HVAC equipment is the least relevant piece of information. The reverberation time is the time it takes for the sound to decay by
60 decibels after the source stops emitting sound. The reverberation time depends on the volume and the surface area of the room, as well as the sound absorption coefficients of the materials that cover the surfaces.
The height and width of the room are needed to calculate the volume and the surface area. The noise reduction coefficient of the ceiling surface and the sound absorption coefficient of the floor surface are needed to calculate the total sound absorption of the room. The operating sound level of the nearest HVAC equipment is not relevant for calculating the reverberation time, but it may affect the background noise level and the speech intelligibility in the room.