43. A mutation results in a cell that no longer produces a normal protein kinase for the M phase checkpoint. Which of the following would likely be the immediate result of this mutation? (A) The cell would prematurely enter anaphase. (B) The cell would never leave metaphase. (C) The cell would never enter metaphase. (D) The cell would never enter prophase. (E) The cell would undergo normal mitosis, but fail to enter the next G1 phase.