Which type of reaction occurs when 2-iodo-2-methylpropane, ${\text{C(C}}{{\text{H}}_{\text{3}}}{{\text{)}}_{\text{3}}}{\text{I}}$, reacts with aqueous sodium hydroxide, NaOH(aq)?

A.     Addition

B.     Free-radical substitution

C.     ${{\text{S}}_{\text{N}}}{\text{1}}$

D.     ${{\text{S}}_{\text{N}}}{\text{2}}$

C