You get the possibilities (E,F): (3,2), (2,3), (0,-1), (-1,0)
From (B):anything in the world
But taken together, if E is negative, then the pair must be (-1,0)
a great work! you all guys had to see that 2 is a prime, and since E and F are integers there are not so many combinations: 1 and 2 plus negatives.
C is correct.