Haloalkanes And Haloarenes

Which amongst the following reactions of alkyl halides produces isonitrile as a major product?

(A) \(\mathrm{R-X+HCN\to}\)

(B) \(\mathrm{R-X+AgCN\to}\)

(C) \(\mathrm{R-X+KCN\to}\)

(D) \(\mathrm{R-X+NaCN\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{{C_2}{H_5}OH}^{{H_2}O}}}\)

Choose the most appropriate answer from the options given below: