Ir is the answer to your question.
1. C because of the sensory details, Plunging and gloom.
2. A the calmness of the sea...
An adverb clause will meet three requirements:
First, it will contain a subject and verb.
You will also find a subordinate conjunction that keeps the clause from expressing a complete thought.
Finally, you will notice that the clause answers one of these three adverb questions: How? When? or Why? From this given information you can tell the answer is,<span> A) No I haven't been to a museum since my family moved here.</span>
