Answer:
The correct answer option is a. It sounds like a great band.
Step-by-step explanation:
A clause or group of words which can form a complete sentence by making sense on their own is said to be an independent clause.
However, an independent clause needs to have a subject and a predicate to express a complete thought.
Here in the given example, 'It sounds like a great band' is an independent clause which is a complete sentence on its own.