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here first we find network Id  means that all host bit zero and net id all 1's  and if  see id  of first octet is 192 so its belongs to class C which range( 192-223) so  

 Net id -->  192.168.1.187

mask----> 255 .255 .255.224

---------------------------------------------------------

AND operation-->  192.168.1.160  ( net id)

and  directed broadcast --> all host bit 1.  so ---->  192.168. 1. 10111111

                                                                 ------> 192.168.1.191

so option D ia correct
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