Final answer:
The cell range starting with the first cell of the second column and ending with the last cell of the third column in a three-column and four-row spreadsheet would be expressed as B1:C4.
Step-by-step explanation:
To express a cell range in a spreadsheet, you typically use the letter of the column followed by the number of the row to reference both the beginning and end of the range.
For example, if the nurse has data filling three columns (let's say columns A, B, C) and four rows, and she wants to name the range that starts with the first cell of the second column and ends with the last cell of the third column, the cell range would begin with B1 and end with C4.
Therefore, the range would be expressed as B1:C4.