爷爷今年68岁，妈妈比爷爷小得多，妈妈可能请选择ABC)W'N/B7Z*k3f+F1B+h'{6A'R*w.m0u5V/O,t'B(j
A．65岁+h'{6A'R*w.m0u5V/O,t'B(j
B．56岁+h'{6A'R*w.m0u5V/O,t'B(j
C．42岁+h'{6A'R*w.m0u5V/O,t'B(j