In the late 1950s and 1960s, television Westerns were extremely popular and included Gunsmoke, Bonanza, Wagon Train, and The Big Valley. When ratings declined as viewers' tastes changed, production of them waned. The television Western was a product category that had entered the stage of its product life cycle.
A) deletion
B) cancellation
C) decline
D) maturity
E) harvesting

(C) Decline  

Explanation:

The decline stage is one of the type of last stage in the product life cycle as it basically representing the actual behavior of the product in the market which results in the form of negative growth.

The decline stage basically demonstrating about the decrease sales and also the profit of the products in an organization.

 According to the given scenario, the television western is one of the type of category that entering into the decline stage due to the change in the taste of the customers.      

 Therefore, Option (C) is correct answer.

the answer is either "loser" or "dumb*ss"

gods, i'm only joking, don't ban me.*

answer may be d i think