Combining two or more selected cells into one cell is called ____ cells.

A) merging
B) mixing
C) combining
D) spanning

The process of combining two or more selected cells into one cell is called "merging." This is commonly used in spreadsheet programs like Excel to create larger cells that span multiple columns or rows. "Mixing" and "combining" may also be used to describe this process, but "merging" is the most widely accepted term. "Spanning" refers to a cell or range of cells that covers a specific area, but does not necessarily involve combining multiple cells into one.