Denise plans to build a swimming pool in her backyard. The pool will be 25 ft long, 10 ft wide, and 6 ft deep. About how many cubic yards of dirt must be removed by an excavator before swimming pool construction can begin?

A) 1500 ydł B) 167 ydł C) 56 ydł D) 500 ydł E) 164 ydł