When You Prune a Rose Plant by Cutting Off the Tips

When you prune a rose plant by cutting off the tips of all the branches, the plant becomes more bushy because

A) auxins are then produced by the shoot to promote secondary growth.
B) the auxins normally produced by the shoot tip were inhibiting the growth of lateral buds.
C) pruning would stimulate the production of auxin that increases apical meristem growth.
D) removing the source of auxin leads to the formation of new lateral buds.