A computer store decides to increase the prices of all the items it sells by 15%. The store manager uses matrices to prepare the new price list. Matrix A contains the unit price of each product in each category. Matrix B contains the revised price of each item in each category. How can the manager obtain the entries for Matrix B? A. by adding 15 to each entry of Matrix A B. by multiplying each entry of Matrix A by 15 C. by multiplying each entry of Matrix A by 1.15 D. by multiplying each entry of Matrix A by 0.15