Answer: A. Paris is an old city, but some is even more ancient.
Explanation:
A is a compound sentence because the there are two complete sentences in the sentence. “Paris is an old city” is a complete sentence. “Some is even more ancient” is another full sentence. If there are two or more complete sentence separated by a conjunction, then It is a compound sentence. B is not a compound sentence, because there is only one complete sentence.
Answer:
C is the correct option.
Explanation:
Mass remains the same on Moon as it was on Earth but the weight differs on Moon because of gravity is less on the Moon than on Earth.