Task: Question Answering
Input (English): Problem: a cheese factory sells its cheese in rectangular blocks . a normal block has a volume of 5 cubic feet . if a large block has twice the width , twice the depth , and the same length of a normal block , what is the volume of cheese in a large block in cubic feet ? 
Options: a ) 15 , b ) 30 , c ) 20 , d ) 18 , e ) 25
Output (English): c