Final Answer:
In datasheet view, clicking a row selector selects an entire A) row.
Step-by-step explanation:
In database applications, such as Microsoft Access, datasheet view is a way to interact with tables or queries in a tabular format similar to a spreadsheet. In this view, each row represents a record, and each column represents a field. The row selector is typically located on the left side of the datasheet and clicking it selects the entire row associated with the clicked row selector.
This is useful for performing operations on entire records, such as deleting or updating information. It does not affect columns, individual cells, or the entire table.
Option A (row) is the answer.