What word best describes the supporting details of a piece writing

citation, approval, corroboration

the main character of "the secret life of walter mitty" retreats into a false pretense as a means escape from his mundane reality -- this is a flagrant issue seen in societies abroad, typically found in young adults and it is robbing our youths of their childhood.

explanation:

a thesis -- a well developed, formal thesis is required to be one sentence long. there are many themes in "the secret life of walter mitty" and i had resolved to give you one of the simpler ones while still honing it with class.

the answer is a)   a sentence of death costs the state "almost three times as much as a sentence of life in prison" (delon 147)