Homing pigeon is useful as a ______ carrier because when taken f

Homing pigeon is useful as a ______ carrier because when taken from home, it will return at the first opportunity.
A、meaning
B、information
C、message
D、content
【正确答案】：C
【题目解析】：译文：家鸽在传递信息方面作用非常大。因为当被带离家时，它会第一时间返回。其中message carrier指“信息的传递者”。答案为C。