luis is deciding to go to college in the Fall of 2020. As per his calculations, he will have to spend $45,000 on his tuition, $7,500 on room and board, and $3,500 on books and supplies. In addition, he will have to give up his part-time job where he is currently earning $11,000. Also he currently spends $5,500 on room and board. What is Thomas's opportunity cost of going to college?

a.$55,000.

b.$48,000.

c.$57,000.

d.$61,500.