Which of the following is one of the terms often applied the members of the counterculture?

The term that is often applied by members of the counterculture is "hippies."

Originally, this term stemmed from the word 'hipster' but was altered to give an identity to those in the 1960s associated with the beat generation.

A hippie is a member of the counterculture of the 1960s, originally a youth movement that began in the United States during the mid-1960s and spread to other countries around the world. The word hippie derived from hipster and is employed to describe beatniks who moved into New York City's Greenwich Village and San Francisco's Haight-Ashbury district. The term hippie first found popularity in San Francisco with Herb Caen, who was a journalist for the San Francisco Chronicle.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).