Recycling, riding bikes instead of using cars all the time, and use reusable straws and water bottles.
C.
The door is made of glass, which is an example of non-porous surface.
Ninhydrin is one of the most widely used reagents for chemical development of fingerprints on porous surfaces.
The correct answer would be C. Hope this helps.
It would be better if I could see the text you’re reading off of
