Which one of the following ether can be prepared by Williamson synthesis in good yields?

$\begin{array}{l}\left(1\right){\left({\mathrm{CH}}_3\right)}_3\mathrm{C}-\mathrm{X}\underset{ }{\overset{{\left({\mathrm{CH}}_3\right)}_3\mathrm{CO}-}{\to }}\underset{\mathrm{major}}{{\left({\mathrm{CH}}_3\right)}_2\mathrm{C}={\mathrm{CH}}_2\left({\mathrm{E}}_2\right)}\\ \left(2\right){\mathrm{C}}_6{\mathrm{H}}_5\mathrm{Cl}\stackrel{{\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{O}}^{-}}{\to }\mathrm{No}\mathrm{reaction}\end{array}$

aryl halides are non-reactive towards nucleophilic substitution reactions.

$\left(4\right){\mathrm{C}}_2{\mathrm{H}}_5{\mathrm{O}}^{-}\stackrel{{\mathrm{CH}}_3\mathrm{Cl}}{\to }{\mathrm{C}}_2{\mathrm{H}}_5-\mathrm{O}-{\mathrm{CH}}_3+\mathrm{NaCl}$