why Do only FEw pilots rEtirE EArly
A．BECAusE pilots ArE muCh nEEDED in thE AirlinE inDustry.
B．BECAusE thE EConomy is gloomy.
C．BECAusE thE Cost oF trAining A pilot is high.
D．BECAusE pilots CAn not Do othEr joBs.