Answer:
Most likely C
Explanation:
Since this sentence is more likely to be past tense, the only past tense answer that grammatically makes sense is C. If that is wrong try A, but I'm pretty sure it should be C
Hope this helps! I would really like a Brainliest, or even a thanks, if this answer helped you!
Answer:
They know all the lyrics to the song; they could sing you the whole song