I get up at 5 o'clock. She gets up at 8 o'clock.

A. I get up more early than her. 

B. I get up more earlier than her.

D. I get up less early than her
=> Chọn B
 I get up more earlier than her.
(So sánh hơn sử dụng cấu trúc:
Nếu từ chỉ có 1 âm tiết: ADJ/ADV + đuôi -er + than)