Answer :
The answer is C. The ferry leaves for the island in fifteen minutes; we need to hurry to catch it.
The sentence is broken up into two parts, separated by a punctuation mark. The other sentences are complete sentences that were joined together but don't have the proper punctuation or conjunction.
The sentence is broken up into two parts, separated by a punctuation mark. The other sentences are complete sentences that were joined together but don't have the proper punctuation or conjunction.