During PATH DESCENT and below the Speed Restriction Altitude, the FMC Alerting Message 'OVERSPEED DICONNECT' means:
A.A.VNAV has disengaged because airspeed has exceeded FMC Speed Restriction by more than 15 knots
B.B.The FMC has disengaged the autothrottles due to excessive Speed
C.C.VNAV has disengaged at VMO minus 5 knots
D.D.VNAV has disengaged because airspeed has exceeded FMC Target Speed by more than 10 knots
正确答案是A