With regard to flight crewmembers duties, which of the following operations are considered to be in the "critical phases of flight"?
A.taxi, takeoff, landing, and all other operations conducted below 3,000 meters MSL, including cruise flight.
B.descent, approach, landing, and taxi operations, irrespective of altitudes MSL.
C.taxi, takeoff, landing, and all other operations conducted below 3,000 meters, excluding cruise flight.
正确答案是C