Which sentence is punctuated correctly?

A) My mother's shoes which cost her less because of a sale looked superb with her evening gown.

B) The horses spent from an entire day running on the track slumped to their stables exhausted.

C) The waiters, dressed in their white jackets, are already arranging the chairs on the sidewalk.

D) My friends who often have shared interests with me still keep in touch with me via social media.