Task: Question Answering
Input (English): Problem: given that p is a positive even integer with a positive units digit , if the units digit of p ^ 3 minus the units digit of p ^ 2 is equal to 0 , what is the units digit of p + 4 ? 
Options: a ) 7 , b ) 8 , c ) 10 , d ) 11 , e ) 12
Output (English): c