Answer:
The correct answer is option C. "the rate increase! by a factor of 2".
Explanation:
The rate of a typical chemistry reaction is positively affected by the concentration of the substrate. Where the more concentrated the substrates are, the faster the reaction occurs. In this case, doubling the concentration of sodium acetate will double the rate of the reaction, since sodium acetate have a positive effect in the reaction by acting as a substrate along with bromoethane.