Which is a complete sentence? a. the highest point in the county. b. extends into parts of montana and idaho. c. a kitchen garden beside the lighthouse. d. there was no fog horn to warn ships away from the rocks.

The answer is D. There was no fog horn to warn away ships from the rocks.

A and B are fragments, not complete sentences. However, if A and B were to be put together, it would be a sentence, but in this case, they are not.

C is a fragment because it doesn't give any information. "A kitchen garden beside the light house", as you can see, it leaves us hanging an also does not have a period.

D is a complete sentence. It has a period, subject, has a main clause, starts with a capital ends with an end mark. There are many other requirements, but those are the main ones for a complete sentence.

D The sentence has a subject and a predicate