When Contemplating a Product Deletion,why Should a Firm Study Customer

 When contemplating a product deletion,why should a firm study customer migration patterns?

A)  To determine the profit contribution of the product to the firm
B)  To determine whether the goods can be produced within the reduced time-to-market estimates to ensure that there is some competitive offering in the market at all times
C)  To determine whether products have reached a level of maturity and saturation in the market
D) To determine whether customers of the product would switch to other substitute products marketed by the same firm