The amount of money, y, in Mary's savings account is proportional to the number of months, x, that have passed since she opened the account. If Mary graphs the relationship on a coordinate plane, what is the meaning of the point (1, 50)? A. Mary opened the account with a $50 deposit. B. Mary deposits $50 into her account each month. C. Mary earned a $50 bonus for opening the account. D. Mary withdraws $50 from her account each month,