12.   Paul bought 9 total shirts for a total of $72. Tee shirts cost $10 and long sleeve shirts cost $7. How many of each type of shirt did he buy? 

       A. 3 tee shirts and 6 long sleeve shirts   B. 5 tee shirts and 4 long sleeve shirts   C. 7 tee shirts and 2 long sleeve shirts   D. 4 tee shirts and 5 long sleeve shirts