When the three-phase asynchronous motor is in normal operation, if the power supply voltage drops, which of the following is correct ( ).

A、thestatorcurrentdecreasesandtherotatingspeedincreases;
B、thestatorcurrentdecreasesandtherotatingspeeddecreases;
C、statorcurrentincreases,rotatingspeedincreases;
D、statorcurrentincreases,rotatingspeeddecreases