Jockeys at most racetracks become familiar with the horses by riding t

Jockeys at most racetracks become familiar with the horses by riding them in early morning workouts which keeps both the jockeys and the horses in good condition.

(A) become familiar with the horses by riding them in early morning workouts which

(B) become familiar with the horses and also ride them in early morning workouts which

(C) become familiar with the horses by riding them in early morning workouts, a practice which

(D) ride horses to become familiar with them in early morning workouts which

(E) ride horses in early morning workouts and become familiar with them which