The correct one-word substitute is "Versatile" — which describes a person who can adapt or function effectively in various situations or roles.
Let’s break down the choices:
(A) Virtuoso – An expert in music or the arts.
(B) Veteran – Someone with long experience, especially in the military.
(C) Versatile – Correct; adaptable, flexible.
(D) Verbose – Someone who talks too much.