Interesting
the question please?
Coffe beans, come from the cocoa tree. It is a widely used, and popular drink.
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.
Answer:
I wish I could help but I sure I saw a question like this on khan academy. you can try there