The Reaction of 1-Bromobutane with Sodium Hydroxide Affords the Substitution

The reaction of 1-bromobutane with sodium hydroxide affords the substitution product 1-butanol.What would happen to the rate of the reaction if the concentration of both 1-bromobutane and sodium hydroxide were doubled?

A) The rate remains the same.
B) The rate decreases by a factor of 2.
C) The rate increases by a factor of 2.
D) The rate increases by a factor of 4.