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 companies used _________ strategy and stopped producing all television Westerns when the netwroks stopped showing them

Multiple Choice

A. a diversification

B. an aggregation

C. a segmentation

D. a deletion

E. a harvesting