Ms. Kitts works at a music store. In December, she sold 6 more than 3 times the number of CDs that she sold in January. Ms. Kitts sold a total of 108 CDs during the 2 months. Which system of equations can be used to find the number of CDs she sold in December, d, and the number of CDs she sold in January, j? d+j = 108 j= 3d +6 O A. O B. D. d+j = 108 j=3d-6 d+j = 108 d = 3j-6 d+j = 108 d = 3j+6