O conveys Blackacre "to A for life, then to B for life, but if B renounces his US citizenship before A's death, then to C instead." What estates are created by the conveyance?

A) life estate in A, alternative contingent remainder in B for life, alternative contingent remainder in C in fee simple absolute, reversion in O in fee simple absolute.

B) life estate in A, vested remainder subject to total divestment in B in a life estate, executory interest in C in fee simple absolute, reversion in O in fee simple absolute.

C) life estate in A, alternative contingent remainder in B for life, alternative contingent remainder in C in fee simple absolute.

D) life estate in A, vested remainder subject to total divestment in B for life, executory interest in C in fee simple absolute.