Which contains a sentence error?

I am not ready to quit the soccer team. The others have improved more than I have.

I am not ready to quit the soccer team, the others have improved more than I have.

I am not ready to quit the soccer team, but the others have improved more than I have.

I am not ready to quit the soccer team, yet the others have improved more than I have.

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Verified Answer :

I am not ready to quit the soccer team, the others have improved more than I have. contains a sentence error because it needs a conjunction to out the two clauses together.

Answer:

I am not ready to quit the soccer team.