X and Y Are Partners

Multiple Choice

X and Y are partners.Z is a third party who deals with Y.X will not be liable for an act by Y done in the usual way of business of the kind carried on by the partnership if:

A) Y has express authority to act for the partnership in the particular matter.
B) Z knows that Y has authority.
C) Z believes Y to be a partner.
D) Z does not know that Y is a partner.