Pressing F8 key for three times selects                          ?

The correct answer is A sentence because, within Microsoft Word's selection expansion mode, the F8 key increases the text selection area based on a specific structural hierarchy.

• A sentence: This is the correct choice. Pressing F8 once turns on selection mode; pressing it twice highlights the nearest individual word; pressing it a third time expands the focus to encompass the entire current sentence.


• Incorrect Options:
  
  
  
  • A paragraph: This is incorrect. Highlighting an entire paragraph requires pressing the F8 key four consecutive times.
  
  
  • A whole document: This is incorrect. Selecting the complete document using this method requires pressing the F8 key five consecutive times.