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.
You can show them respect by having compassion for them.
Answer:
Not only was Africa a center for the growth of extremely useful plants like rubber and spices, it was also geologically fit in the circulation of economic activity through Oceanic and land based trade routes.
Explanation: