One month ago, Emily had twice as much money in her bank account than Mike and Mike had $200 more than Kelly. If Emily and Mike each deposited $200 in the past month and Kelly deposited $300 in the past month, which of the following must be true today?
I. Mike has more money in his account than Kelly has.
II. Mike's account balance today is half of Emily's account balance today.
III. Emily has more money in her account than Kelly has.