Available choices:
(i) hard outer covering
(ii) circulatory systems
(iii) peachleaf willow
(iv) carbohydrates
(v) inactive
(vi) Green beans
(vii) Change colors
(viii) support
Q: You are presented with the quiz "What do leaves form for the rest of the plant?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "photosynthesis means producers convert from carbon dioxide, water, and solar energy into carbohydrates for themselves" and "photosynthesis is the chief function of leaves". So, what's the best answer to the question?
A:
(iv)