Sentence Correction

The current economic downturn has significantly reduced advertising income both for
business journals as well as general consumer magazines, especially if focusing on
technology.
A. has significantly reduced advertising income both for business journals as well as
general consumer magazines, especially if focusing
B. has significantly reduced advertising income both for business journals and for
general consumer magazines, especially those focusing
C. significantly reduced advertising income for both business journals and for
general consumer magazines, especially when focused
D. reduced both business journals' and general consumer magazines' advertising
income significantly, especially if focused
E. reduced advertising income significantly for both business journals, as well as for
general consumer magazines, especially those focusing

OA is B

In Both A and B is the correct usage
Both in A and B is the wrong usage

so both for A and B should be wrong if ( Both in A and B is the wrong usage) is wrong..
pl sumbdy explain