Final answer:
To select everything in an entire document, you should move the pointer to the left of any line and when the arrow pointer displays, triple-click.
Step-by-step explanation:
The correct option that enables you to select everything in an entire document is to move the pointer to the left of any line and when the arrow pointer displays, triple-click. Triple-clicking selects the entire line, and since all lines make up the document, this action selects everything in it.