Why Is Estoppel Different from Apparent Authority

Multiple Choice

Why is estoppel different from apparent authority?

A) Because estoppel does not require the purported principal has made any manifestation that the purported agent can act for her.
B) Because estoppel does require the purported principal to make manifestations that the purported agent can act for her.
C) Because apparent authority does not require the purported principal has made any manifestation that the purported agent can act for her.
D) Estoppel is the same as apparent authority.