Task: Question Answering
Input (English): Problem: if a and b are positive numbers , and a ^ 3 + b ^ 3 = 140 , then the greatest possible value of a is between : 
Options: a ) 0 and 2 , b ) 2 and 3 , c ) 3 and 4 , d ) 4 and 5 , e ) 5 and 8
Output (English): e