Choose the best revision for each run-on sentence.

1. Roosters begin to crow at dawn they seem to act as a natural alarm clock for the other animals.

A. Roosters begin to crow at dawn; they seem to act as a natural alarm clock for the other animals.
B. Roosters begin to crow at dawn, they seem to act as a natural alarm clock for the other animals.
C. Roosters begin to crow at dawn, but they seem to act as a natural alarm clock for the other animals.