Question

Which best identifies the adverb clause?

No, I haven't been to a museum since my family moved here.

There is an interesting exhibit right now about Native American artifacts.

You should come with my family and me to see it.

Have you ever been to your local historical society?

Answer 1

An adverb clause starts with a subordinating conjunction, such as although, after, before, because, if, since, when, ...
The rest of the clause is basically a mini-sentence.

Answer 2

For example: I went to the store because we were out of milk.
because - subordinating conjunction
we were out of milk - mini-sentence
The adverb clause is "because we were out of milk."