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

1. A.
   he explained
2. B.
   what he explained
3. C.
   how he explained
4. 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?

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

  A. he came up with                   B. what he came up with  

C. how he came up with               D. why he came up with  

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

     A.he explained   B.what explained   C.how 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