Is this the reason ________ at the meeting for his carelessness in his work?

A．explained

B．what he explained

C．how he explained

D．why he explained

针对动画中的车刀移动轨迹，为了实现刀尖半径补偿，相应的G代码应该取（）

A.外圆加工用G42，内孔加工取G41

B.外圆加工用G42，内孔加工取G42

C.外圆加工用G41，内孔加工取G41

D.外圆加工用G41，内孔加工取G42