The correct answer is: A. The autosum button
The autosum button is a quick way to add up a series of numbers in a spreadsheet. To use it, simply select the cells that contain the numbers you want to add, and then click the autosum button. The formula =SUM(selected cells) will be inserted into the cell, and the total will be calculated automatically.
The formula button is used to insert a formula into a cell. To use it, click the formula button and then select the formula you want to insert. The formula will be inserted into the cell, and the result will be calculated automatically.
The quicktotal button is used to add up a series of numbers in a column or row. To use it, click the quicktotal button and then select the column or row that contains the numbers you want to add. The total will be calculated automatically and displayed in the cell below the last number in the column or row.
The total button is used to add up all the numbers in a spreadsheet. To use it, click the total button and then select the range of cells that contains the numbers you want to add. The total will be calculated automatically and displayed in a new cell.