Row 11 contains total sales values for the first quarter period. C11, D11, and E11 contain totals for January, February, and March respectively. F11 contains a formula that calculates a grand total for the quarter. C13 contains the formula =C11/F11 calculating the percent of January’s sales to the grand total. You want to adjust this formula so you can copy it to cells D13 and E13. Which of the following formulas should you use?