Consider the question. What happens before the rigid structure that surrounds the plant cell dilates?
Options:
- (A) It decreases
- (B) competition
- (C) air cools
- (D) relaxation
- (E) cracking
- (F) sweating
- (G) rapid expansion
- (H) It expands
 If the answer is '(D)'; explain the reasoning:
Dilation occurs when cell walls relax. Cell wall is the rigid structure that surrounds the plant cell. Dilation occurs when the rigid structure that surrounds the plant cell relaxes.