​For substitutes,cross price elasticity of demand is:

A) ​Negative
B) Positive
C) between zero and one only
D) ​zero. 

Cross Price Elasticity

A measure of how the demand for one product changes in response to a change in the price of another product, indicating substitutes or complements.

Substitutes

Goods or services that can replace each other in use, affecting demand when their prices or other attributes change.

Demand

The quantity of a product or service consumers are willing and able to purchase at various prices.