Step 1: Core meaning.
A virtuoso is someone with exceptional technical skill, especially in the arts (commonly music).
⇒ The essence is “highly skilled performer.” Step 2: Eliminate close but incorrect options.
(B) Amateur ⇒ a non-professional; says nothing about high skill ⇒ opposite sense.
(C) Good person ⇒ moral quality, not skill ⇒ irrelevant.
(D) Professional ⇒ paid to do it; may or may not be highly skilled ⇒ not the precise sense.
\[
\boxed{\text{(A) Skilled performer}}
\]