Under the Indian Contract Act, 1872, A promises B to drop a prosecution which he has instituted against B for robbery, and B promises to restore the value of the things taken. The agreement is:

Correct option is C

Under Section 23 of the Indian Contract Act, an agreement that involves compromising prosecution of criminal offenses is void, as it violates public policy.
Information Booster:
A contract to drop criminal charges in exchange for something is unenforceable and void as it promotes compromising justice.
Additional Information:
· Option (a), (b), (d): Such agreements are neither valid nor voidable. They are outright void for being against public policy.