In a laundromat, Washing Machine A was used 48 times in a month. This was 4 times the number of times Washing Machine B was used in that same month. Which set of equations shows the number of times Washing Machine B was used during that month?
A. ? + 4 = 48 , 48 - 4 = ?
B. ? + 4 = 48 , 44 + 4 = ?
C. ? x 4 = 48 , 12 x 4 = ?
D. ? x 4 = 48 , 12 + 4 = ?​