The correct answer is: D. Dragging over the desired cells
To select a single range of cells, you can drag over the desired cells. To do this, click on the first cell in the range, hold down the left mouse button, and then drag the cursor over the remaining cells in the range. When you release the mouse button, the cells will be selected.
Option A is incorrect because you would use the Shift key to select multiple ranges of cells, not a single range. Option B is incorrect because you would use the Ctrl key to select non-contiguous cells, not a single range. Option C is incorrect because you would use the Shift key and an arrow key to select a single cell, not a range of cells.