I've tried to find the answer to this question everywhere and don't seem to be having any luck, please help!

Most of the dry weight of a plant is the result of uptake of
A. water and minerals through root hairs
B. water and minerals through mycorrhizae
C. CO2 through stomata in leaves
D. CO2 and O2 through stomata in leaves
E. both A and B

I would say D. Although I may be wrong.