<span>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.</span>
Basically, you're good to go, meaning, it's okay to proceed without restriction.
Your answer is D
All of the other sentences are incomplete and seen to stop in the middle
