When Auxin Accumulates on the Lower Side of the Shoot

When auxin accumulates on the lower side of the shoot of a germinating seed, it:

A) decreases cell elongation on the lower side of the shoot.
B) increases cell elongation on the lower side of the shoot.
C) decreases the use of energy by the cells in the shoot.
D) increases the use of energy by the cells in the shoot.
E) has no effect on the shoot (it affects only the developing root) .