Choose the Answer Which Best Rewords the Italicized Portion

Multiple Choice

Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A.
Therefore the etiquette rules differs depending on where a person lives.

A) Therefore the etiquette rules differs
B) Therefore the etiquette rules differ
C) Therefore, the etiquette rules differs
D) Therefore, the etiquette rules differ