Step 1: Understanding the key function in MS Word.
In MS Word, the F7 key is used to check spelling and grammar in a document.
Step 2: Analyzing the options.
- (A) F6: This is used to toggle between panes in MS Word, not for checking spelling and grammar.
- (B) F3: This is used to change case in MS Word, not for checking spelling and grammar.
- (C) F8: This is used to extend the selection in MS Word, not for spelling and grammar.
- (D) F7: This is the correct answer, as F7 opens the spelling and grammar check in MS Word.
Step 3: Conclusion.
The correct answer is (D) F7.