An old lady has taken her 10-year-old granddaughter traveling over half of China and to nearby countries. When her granddaughter was 10 months old, she traveled for the first time to Fuzhou, a city about 250 kilometers away from Xiamen where they live. When she was 4, they went to Southwest China's Tibet. The 70-year-old surnamed Zhang said her little girl has developed an independent and conscientious character at an early age.

How old is the granddaughter?

A. Ten months old

B. Four years old

C. Ten years old

（中國日報網英語點津 Helen 編輯）