a.y^-2+yb.-(y^2) + -yc. y^-2 - yd. -(y^2) + y
additive inverse is defined as the item you can add to the original one and get 0 as a result. so for a number 2, its additive inverse is -2 because 2 + -2 = 0. so the additive inverses of the terms you list above means to change their signs, so the answer would be b
