MPF Activity Was Discovered When Cytoplasm from a Xenopus M-Phase

MPF activity was discovered when cytoplasm from a Xenopus M-phase cell was injected into Xenopus oocytes, inducing the oocytes to form a mitotic spindle.In a control experiment, Xenopus interphase cytoplasm was injected into oocytes and shown not to induce the formation of a mitotic spindle.Which of the following statements is NOT a legitimate conclusion from the control experiment?

A) The piercing of the oocyte membrane by a needle is insufficient to cause mitotic spindle formation.
B) An increased volume of cytoplasm is insufficient to cause mitotic spindle formation.
C) Injection of extra RNA molecules is insufficient to cause mitotic spindle formation.
D) Components of an interphase nucleus are insufficient to cause mitotic spindle formation.