Dr.S.Radhakrishnan has written an erudite commentary on the Bhagwad Gita.

Answer: Option A

Scholarly : involving or relating to serious academic study.
Inspiring : having the effect of inspiring someone.
Effective : successful in producing a desired or intended result.
Perfect : having all the required or desirable elements, qualities, or characteristics; as good as it is possible to be.
Erudite : having or showing great knowledge or learning.

Synonym of Erudite is Scholarly