John opens a savings account with an initial deposit of $2000. He deposits $35 each week. Mary's savings account is represented by the function y = $45x + $2800 , where y is the balance of Mary's savings account after her initial deposit and a number of weekly deposits, x. Which statement BEST compares the rate of change for the two accounts? A) Mary deposited $800 less than John. B) John deposits $10 more each week than Mary. C) John deposits $10 less each week than Mary. D) Mary deposits $7 for every $9 John deposits.