Grandma Jones Has $300,000 in a Bank Account, Which Pays

Grandma Jones has $300,000 in a bank account, which pays her interest at 3%. What is the largest amount of money that she could take out now and still leave enough in the account so that she can earn $600 per month in interest?

A) $60,000
B) $100,000
C) $280,000
D) $240,000
E) $9,000