Cats make good house pets. It's the main idea in the sentence, and it's independent also. The other clause is dependent, so it is not the main clause.
█ Explanation <span>█
The phrase that indicates the contrast being made is the conjunction. The conjunction in this sentence is on the other hand.
Answer: Letter D
</span><span>Hope that helps! ★ <span>If you have further questions about this question or need more help, feel free to comment below or leave me a PM. -UnicornFudge aka Nadia </span></span>