During conjugation, if an Hfr cell mated with an F- cell, why will the F- cell remain F-?

A. The recipient will not remain F-, it will become F+.
B. The recipient will not remain F-, it will become Hfr because of the donor cell genome.
C. The cells would not stay in contact long enough for the entire Hfr genome to be transferred.
D. The donor cell is not an F+ cell, it is Hfr.