If the demand for salad dressing increases when the price of lettuce decreases, the cross-price elasticity of demand between salad dressing and lettuce will be _ because these two goods are _.

If the demand for salad dressing increases when the price of lettuce decreases, the cross-price elasticity of demand between salad dressing and lettuce will be _ because these two goods are _.
A.negative; complements
B.zero; inferior
C.equal to 1; inelastic
D.negative; substitutes
正确答案：negative; complements