During the latter stages of the insurrection, the revolution's leaders : Sentence Correction (SC)

During the latter stages of the insurrection, the revolution's leaders resorted to ever more violent means, including public execution of members of the upper class, to establish their authority, and they suppressed dissent ruthlessly.

A. to establish their authority, and they suppressed

B. that established their authority, and it suppressed

C. of establishing their authority and to suppress

D. to establish their authority, and they were suppressing

E. so that their authority was established, and it suppressed