20.下列隱形眼鏡材質單體,何者具有離子性且可提高含水量?(A)甲基丙烯酸甲酯(methyl methacrylate)(B)乙二醇二甲基丙烯酸酯(ethylene glycol dimethacrylate)(C)甲基丙烯酸(methacrylic acid)(D)甲基丙烯酸甘油酯(glyceryl methacrylate)