Which of the following does NOT s来自upport the i36问答dea that P吃降hobos...

Which of the following does NOT support the idea that Phobos is just an asteroid?A．It is much smaller than other moons.B．It is made of asteroid-like material.C．It has an irregular shape.D．It is filled with frozen water.请帮忙给出正确答案和分析，谢谢！