A doghouse is to be built in the shape of a right trapezoid, as shown below. What is the area of the doghouse?

A right trapezoid with top side 7 feet and height 7 feet. The bottom side is extended to the right with 3 more feet.

A) 24.5 square feet
B) 59.5 square feet
C) 70 square feet
D) 147 square feet