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 three times the width , twice the depth , and half the length of a normal block , what is the volume of cheese in a large block in cubic feet ? 
Options: a ) 10 , b ) 30 , c ) 15 , d ) 20 , e ) 25
Output (English): c