Task: Question Answering
Input (English): Problem: if the operation x is defined by a x b = ( b - a ) ^ 2 / a ^ 2 for all numbers a and b , and a ≠ 0 , then − 1 x ( 1 x − 1 ) = 
Options: a ) − 1 , b ) 0 , c ) 1 , d ) 25 , e ) 29
Output (English): d