Question #N1146

The sentence "The cat sat on the mat, and then it ate the mouse." contains a comma splice. Which of the following revisions corrects the comma splice?
A. The cat sat on the mat and then it ate the mouse.
B. The cat sat on the mat, it then ate the mouse.
C. The cat sat on the mat, and then it ate the mouse.
D. The cat sat on the mat then it ate the mouse.