Which sentence uses a comma and a coordinating conjunction correctly to separate two independent clauses?
A. It was actually Mr. Confrey, the groundskeeper
, who had locked
the gate
B. Kenneth looked around at the empty room, yet he couldn't shake
the feeling of being watched
C. With a flick or her wand, Madam Hess produced a tray of tea and
biscuits
D. The children all waved their hands in the air but, it was Emily who
was chosen to volunteer