What number must be added to 8 to give the result -5 ?
(A) 3
(B) -3
(C) 13
(D) -13
(E) -10
To determine the number that must be added 8 to give the result -5 , we subtract 8 from -5 to get $(-5)-8=-13$. Checking, $8+(-13)=-5$.

ANSWER: (D)