Which of these processes was used to form the word subculture? use a dictionary if necessary.

prefix addition
suffix addition
compounding
telescoping
shortening
back formation

Back formation was used to form the word subculture.

back formation

Explanation:

A subculture is a gathering of individuals inside a culture that separates itself from the parent culture to which it has a place, frequently keeping up a portion of its establishing standards. So to a word with a word subculture, the back development will be the ideal match to interface between them.  

Subculture can likewise be communicated as subsociety, human advancement, culture, life, way of life, society. customs, habits, mores, values. old stories, legacy, inheritance, convention.

Likewise, subculture would remember contrasts for intrigue, practices or convictions, similar to religion, ethnicity, and social or monetary status. So the word that is framed from a previously existing word from which it gives off an impression of being a subordinate, will shape the word subculture.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

the term is einsatzgruppen