During Middle Childhood,Shannon Became Increasingly Flexible and Was Able to Perform

Multiple Choice

During middle childhood,Shannon became increasingly flexible and was able to perform cartwheels and handstands.This is probably because

A) her ligaments were not yet firmly attached to bones.
B) the bones of her body had shortened and narrowed.
C) she was losing "baby fat" at an increasing rate.
D) her bones were strengthening while her muscles were weakening.