Prefabrication is a source reduction strategy that can help eliminate waste produced by a project. It involves the production of components in a factory before being transported to the construction site for assembly. This method reduces waste as it allows for precise measurements and controlled conditions, minimizing the amount of excess material produced.

For the Materials and Resources Credit, Building Life-Cycle Impact Reduction, Option 2. Renovation of Abandoned or Blighted Buildings, up to 25% of the building surface area may be excluded from the credit calculation due to deterioration or damage1.
Reference:
LEED Certification- Requirements for Material & Resource Credit: Building Life-Cycle Impact Reduction - Firstgreen Consulting Pvt Ltd

Food gardens may be included or excluded from the calculations for Water Efficiency Credit, Outdoor Water Use Reduction, as per the project team's discretion. If included, food gardens must be calculated using 100% potable water. If excluded, food gardens must be irrigated with 100% captured rainwater, recycled graywater, or water treated and conveyed by a public agency specifically for nonpotable uses. Reference:
Outdoor Water Use Reduction credit in LEED BD+C: New Construction v4.1 - LEED v4.11 LEED v4 BD+C WE Guide2

. Increase the number of skylights
Skylights are openings in the roof or ceiling that allow natural light to enter the building. They can improve daylighting by providing more uniform and diffuse illumination, reducing the need for artificial lighting, and enhancing the visual comfort and well-being of occupants. Skylights can also reduce cooling loads by minimizing solar heat gain through the roof. However, skylights must be designed carefully to avoid glare, overheating, and heat loss issues.
Reference:
Reference Guide for Building Design and Construction v4 - Pages 279-2801 Daylighting | WBDG - Whole Building Design Guide1

Showers are addressed under Water Efficiency (WE) Prerequisite: Indoor Water Use Reduction and Location and Transportation (LT) Credit: Bicycle Facilities. Showers in indoor water use reduction help minimize potable water consumption, while in the Bicycle Facilities credit, they support cycling commuters by providing end-of-trip facilities. The other options refer to credits or prerequisites unrelated to shower facilities.