Which sentence contains a prepositional phrase?

AThey sang it, and sang it again.
BThey tried, although they didn't expect to win.
CWith the proper help, they'll complete the project early.
DRunning all the way, he got there early.

Verified Answer :

W0lf93

The answer is C: "With the proper help, they'll complete the project early."

The word "with" is a preposition because it expresses a relation to the completion of the project. The rest of the phrase answers the question "With what?" Thus, "With the proper help" describes what conditions must occur in order for the project to be completed early.