As Firms Introduce New Products at a Faster Rate, What

As firms introduce new products at a faster rate, what tends to happen to existing products in the product mix?

A) Existing products enter the maturity and decline stages more quickly.
B) Product life cycles become much slower.
C) Production costs for existing products tend to go down.
D) The price of existing products tends to go up.
E) Existing products enter the maturity and decline stages more slowly.