Which of the Following Is (Are)an Effect(s)of Auxin

Which of the following is (are) an effect(s) of auxin?

A) Applied to a woody cutting,auxin causes roots to develop.
B) Auxin production by seeds promotes the growth of fruit.
C) Trees sprayed with auxin will keep mature fruit from falling to the ground.
D) Under the effect of gravity,auxin moves to the lower surface of roots and stems,causing roots to curve downward and stems to curve upward.
E) All of the choices are effects of auxin.