【单选题】Aunt Dotty loves adventure. On her 60th birthday, she went mountain climbing in the Alps. On her 70th birthday, she went on a trip to the North Pole. When she was 80, she drove solo across the United ...
A.
On her 60th birthday, she went mountain climbing in the Alps.
B.
On her 70th birthday, she went on a trip to the North Pole.
C.
When she was 80, she drove solo across the United States.