Which sentence contains a prepositional phrase?

a. they tried, although they didn't expect to win.
b. with the proper , they'll complete the project early.
c. they sang it, then sang it again.
d. running all the way, he got there early.

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.