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

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

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

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

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

Is this the reason ______at the meeting for his carelessness in his work?

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

A．what he explained   B．why he explained   C．he explained       D．how he explained

 Is this the reason ______at the meeting for his carelessness in his work?

A．he explained                           B．what he explained

C．how he explained                       D．why he explained

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

A．What he explained                      B．how he explained

C．he explained                           D．why he explained

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

A．he explained                           B．what he explained

C．how he explained                       D．why he explained