In a positive phototropic response of a coleoptile, the region of greatest curvature is brought about by the
-
A.
movement of auxins away from the region of curvature -
B.
even distribution of auxins in all parts of the coleoptile -
C.
inhibition of growth by auxins in the region f smaller curvature -
D.
concentration of auxins in the region of curvature -
E.
absence of auxins in the coleoptile