It is given that R-com has 28% subscribers in the east and Vodafone has 72% subscribers in the east, these two are the only operators in the east. Similarly, Idea and Airtel are the only players in the south whose shares are 48% and 52% respectively.
We are not given that name of the states which need to be considered under southern part of the country. But the number of subscribers should be in the same ratio of shares.
Checking with the options
Option (A): R-Com's share
=‌‌×100=27.68 percent. We are given that Rcom has 28% shares. Hence, this option is incorrect.
Option (B): R-Com's share
=‌‌×100=29.19 percent. We are given that Rcom has 28% shares. Hence, this option is incorrect.
Option (C): R-Com's share
=‌‌×100=26.88 percent. We are given that Rcom has 28% shares. Hence, this option is incorrect.
Option (D): R-Com's share
=‌‌×100=28percent. We are given that Rcom has 28% shares. Hence, this option is the correct.