Scientists in Scotland Figured Out a Novel Method to Clone

Scientists in Scotland figured out a novel method to clone cells successfully.It involved:

A) using an egg and a nucleus that were at the same stage of the cell cycle
B) using an egg that was in cytokinesis and a nucleus that was in S stage of the cell cycle
C) using an egg that was in the S stage of the cell cycle and a nucleus that just passed through telophase
D) using an egg that was in the S stage of the cell cycle and a nucleus that had just entered prophase