Tobin is having the basement remodeled. The contractor charges $16.50 per hour, plus the cost of supplies. The contractor goes to two different stores for supplies. At the first store the contractor spends $125.00 and at the second store the bill is $289.00. Tobin gets a bill at the end of he project for $826.50. He thought the bill was going to be $701.50. Which of the following explains the error Tobin made? Why?

A. Tobin didn't include the bill for $289
B. Tobin didn't include labor in the. amount
C. Tobin didn't include the bill for $125
D. Tobin didn't include either bill