Which is mostly likely the meaning of reservations as it used in the following sentences? Some members of the family had reservations about taking a plane. They talked about their concerns for weeks before the trip.
A. Requests made in advance for a seat, room, and so on
B. Doubts or reasons for withholding full assent
C. Prior claims on part of something given as a gift
D. Places set aside for a designated group or purpose

Part B which word or phrases in the sentences is the context clue that best supports the answer to part A?
A. Taking a plane
B. Talked
C. Concerns
D. Before the trip