A child of unusual or remarkable talent

A. Scholar

B. Diligent

C. Freak

D. Prodigy

Answer: Option D

Solution(By Examveda Team)

One word substitute is Prodigy.

Scholar: a specialist in a particular branch of study, especially the humanities.
Diligent: having or showing care and conscientiousness in one's work or duties.
Freak: a very unusual and unexpected event or situation.
Prodigy: a young person with exceptional qualities or abilities.