7888. In the absence of the chief guest, the host himself acted as his surrogate and presided over the function.

✅ The correct answer is option D.
Countertpart : a person or thing that corresponds to or has the same function as another person or thing in a different place or situation.

Alliance : a union or association formed for mutual benefit, especially between countries or organizations.

Assistant : a person who ranks below a senior person.

Substitute : a person or thing acting or serving in place of another.

Surrogate : a substitute, especially a person deputizing for another in a specific role or office.

Synonym of Surrogate is Substitute