from deduction rules (http://aptitude.gateoverflow.in/2346/cat1999-125#a2370)
option A) 1.All IIMs are in India.
2.No BIMs are in India.
given conclusion :No IIMs are BIMs. its correct , follow all rules .
option B) 1.All IIMs are in India.
2.No BIMs are in India
given conclusion : No BIMs are IIMs , its correct , does not violate any rules
option C ) 1.Some IIMs are not in India
2.Some BIMs are not in India.
given conclusion : Some IIMs are BIMs. here is no conclusion , according to 5,6 rules , if both premise contain negative and particular statements then there is no conclusion so its false
option D) 1.Some IIMs are not in India.
2.Some BIMs are not in India
given conclusion : Some BIMs are IIMs. , here is no conclusion , reason same as option C . so its false
so option A and B are correct hence option 1 ) correct ans