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Gun control is a subject ______ Americans have argued for a long time.

A. of which    B. with which     C. about which      D. into which

Gun control is a subject     Americans have argued for a long time. 

A. of which      B. with which     C. about which      D. into which

Gun control is a subject ______ Americans have argued for a long time.

A. of which    B. with which     C. about which      D. into which

Gun control is a subject ______ Americans have argued for a long time.

A. of which??? B. with which???? C. about which????? D. into which

Gun control is a subject _______ Americans have argued for a long time.

A. of which                          B. with which            C. about which                   D. into which

Gun control is a subject_______ Americans have argued for a long time.

A. of which 　　 B. with which        C. about which       D. into which

Gun control is a subject ______Americans have argued for a long time.

A. of which       B. with which    C. about which       D. into which

Gun control is a subject ________Americans have argued for a long time,

   A. of which       B. with which     C. into which      D. about which 

 Gun control is  a subject ______Americans have argued for a long time .

A. of which                                             B. with which      

C. into which                                        D. about which

 Gun control is a subject         Americans have argued for a long time .

A. of which     B. with which    C. about which     D. into which