Fact 1: Dilation occurs when cell walls relax. Fact 2: Cell wall is the rigid structure that surrounds the plant cell. Given the two facts above, what happens before the rigid structure that surrounds the plant cell dilates?

Options are:
(A). It decreases;
(B). competition;
(C). air cools;
(D). relaxation;
(E). cracking;
(F). sweating;
(G). rapid expansion;
(H). It expands;
Answer:
(D).