Which of the following sentences is punctuated correctly?

a. mark and ryan who had been sitting there for an hour finally decided to leave.
b. mark and ryan, who had been sitting there for an hour, finally decided to leave.
c. mark and ryan, who had been sitting there for an hour finally decided to leave.

the rhetorical technique most used in this excerpt is parallelism. parallelism is a technique which author used in sentence as substitute of repeated synthetical similarities. it is the effect of rhetorical technique.

explanation:

a biography is a genre that mainly accounts somebody's life and that is written by somebody else. this genre supports sonia nazario's desire to share enrique's life because she can fully inform readers of his entire emotional journey.

in a biography, an author can share the readers almost everything about a person's life, or just one key event or personal aspect the author is interested in telling, like in this specific case in which sonia nazario is centered in enrique's emotional journey.