In the chemical process of photosynthesis, water is a

Question

anonymous · Answer

A    catalyst  
B    enzyme  
C product 
D reactant

ltrout · Answer

Btw @eyesnapper , giving out direct answers is against their code of conduct and can get you banned.

eyesnapper · Answer

@ltrout Okay. Thanks for informing me. Do you know if I can give an answer if I also give the reason?

ltrout · Answer

@eyesnapper , It's best to give help first and ask them what their choice is then as they understand it you can give them the answer. But as long as you provide why and how to do it next time you can.

eyesnapper · Answer

@ltrout Alright. I understand now. Thank you. 
*bestows medal* for explaining to me xD