Stanley has two large books he needs to store in his locker at school. His math book measures 2.5 inches thick × 6 inches long × 9 inches tall. His social studies book measures 3 inches thick × 7 inches long × 10 inches tall.
What is the total volume of Stanley's two books?
A) 90 cubic inches
B) 135 cubic inches
C) 210 cubic inches
D) 345 cubic inches
