Select the grammatically correct sentence

A

The easiest way to solve a issue was to accept the demands of the strikers unconditionally.

B

The easiest way to solve an issue was to accept a demands of the strikers unconditionally.

C

The easiest way to solve the issue was to accept the demands of the strikers unconditionally.

D

An easiest way to solve the issue was to accept an demands of the strikers unconditionally.