For Use as Watermark,Alba Wants to Insert a Picture as a Worksheet

Multiple Choice

For use as watermark,Alba wants to insert a picture as a worksheet background.For this,she clicks the worksheet she wants to display with a background,then selects an option X from the Page Layout tab in the Page Setup group.Alba then selects the picture for use as background,and then clicks Insert.What can X in her series of selections be?

A) Breaks
B) Margins
C) Orientation
D) Background