SAT English Practice Question

In the following sentence, a comma splice has been used. "The sun was setting, the sky was ablaze with color." Which choice below is the best way to correct the comma splice?

1. A.The sun was setting and the sky was ablaze with color.
2. B.The sun was setting; the sky was ablaze with color.
3. C.The sun was setting, but the sky was ablaze with color.
4. D.The sun was setting; and the sky was ablaze with color.