Concept:A cell is the intersection of a row and a column in a spreadsheet.
Counting the filled cells in row 1 of Table 3 gives the required number.
Explanation:Row 1 is a horizontal line of cells.
In the table, row 1 contains these entries: BOOKS, SUPPLIED, TO SENIOR, HIGH, and SCHOOLS.
Each of these entries occupies one separate cell.
So, count all cells that contain data in row 1.
Total number of cells with data in row 1 is
5.
Answer:C.
5