单选题 Which is the best word to describe air traveler's reaction to airline alliances?

【正确答案】 D
【答案解析】文中第一段说Aidine alliances have travelers scratching their heads over what’s going on in the skies，意为“航空公司使得旅行者脑子一片混乱，不知道他们的意图”，选项D正确。