The correct answer is explain.
A. leave exposed
C. adopt self-important mannerisms
The correct answer is (B) To explain; to set forth in detail; to explain; to interpret.
Expound comes from Middle English expounen, Old French espondré, Latin exponere (to put forth).
Examples of use:
- He often would expound at length on community issues.
- She expounded on the essential beliefs of the religion.