Which statements about substitution reactions are correct?

I.     The reaction between sodium hydroxide and 1-chloropentane predominantly follows an \({{\text{S}}_{\text{N}}}{\text{2}}\) mechanism.

II.     The reaction between sodium hydroxide and 2-chloro-2-methylbutane predominantly follows an \({{\text{S}}_{\text{N}}}{\text{2}}\) mechanism.

III.     The reaction of sodium hydroxide with 1-chloropentane occurs at a slower rate than with 1-bromopentane.

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

B