Which of the following is characteristic of the growth of a scalp hair?

A) continuous steady growth until the hair is shed and replaced by a new hair
B) alternating growth phases and resting phases throughout the life of the hair
C) a resting phase followed by a growth phase, which lasts until the hair is shed and replaced by a new hair
D) a growth phase followed by a resting phase, which lasts until the hair is shed and replaced by a new hair