O conveys Whiteacre "to A for life, then to the children of B." At the time, of the conveyance, B has one child (W). A year after the conveyance, B has one child (X). Then, a year after X's birth, A dies. Two years after A's death, B has twins (Y and Z). Assuming that no other transfers have taken place and that B, X, Y and Z are all still alive, who owns Whiteacre at that time (after the birth of Y and Z)?

A) W and X.

B) W, X, Y, and Z.

C) W.

D) B and W.