A does not make sense because the phone billing company would not be cutting off the money they earn while Jeremiah is on a call with someone.
B does not make sense because the phone billing company would be charging Jeremiah a higher amount than the amount he uses while speaking on the phone.
C makes sense because the phone billing company charges Jeremiah the total amount of his phone and $2 per hour he is on a phone call with someone.
D does not make sense because the total is 30 not h.