In the Late 1950s and 1960s,television Westerns Were Extremely Popular

In the late 1950s and 1960s,television westerns were extremely popular.These adventure shows had settings and costumes that were very unlike other shows of that time (comedy,variety,crime,etc. ) .Popular programs included Gunsmoke,Bonanza,Wagon Train,The Big Valley etc.When ratings declined as viewers gradually stopped watching this TV genre,production companies found the networks no longer wanted to buy and televise such shows.The production companies used a __________ strategy and stopped production on all television westerns when the networks stopped showing them.

A) diversification
B) aggregation
C) segmentation
D) deletion
E) harvesting