In line 7, when the author states that the owners "anxiously watch the sky" there is

Đáp án A

Thông tin trong bài “In their training flights or in actual races, the birds are taken to prearranged distant points and released to find their way back to their own lofts. Once the birds are liberated, their owners, who are standing by at the home lofts, anxiously watch the sky for the return of their entries”

→ tác giả chỉ ra rằng chủ nhân những con chim muốn chúng thắng cuộc đua khi nhìn một cách lo lắng lên bầu trời