Here's why:
* Prepositional phrases consist of a preposition (like "with", "in", "on", "at") followed by an object (a noun or pronoun).
Let's break down the sentences:
* A. With the proper help complete project early.
* "With the proper help" is a prepositional phrase. "With" is the preposition, and "the proper help" is the object.
* B. Running all way he got there
* This sentence doesn't have a prepositional phrase. "Running" is a verb and "all way" doesn't function as a prepositional phrase.
* C. They sang it and?
* This sentence is incomplete and doesn't contain a prepositional phrase.
Therefore, only sentence A contains a prepositional phrase.