Which among the following key is used for checking grammar and spelling in MS…

Concept: In Microsoft Word, each function key (F1 to F12) is bound to one designated command. Some of these commands act on whatever text, object, or field is currently selected, so their visible effect depends on that selection (for example, moving a selected object or refreshing a selected field). Others open a fixed, standalone tool that runs the same way whether or not any text is selected.

Application: The question asks which key opens the tool used to check spelling and grammar in a Word document. Among the four keys offered, Microsoft's official Word documentation assigns this task to F7: pressing F7 opens the Spelling and Grammar pane, which scans the document (the current selection if one exists, otherwise the whole document) and lists possible issues for review.

Cross-check: comparing the assigned command of each offered key in Word confirms only one of them is this standalone proofing tool; the rest are selection-dependent editing/navigation actions or an unrelated Help command.

• F1 opens a separate Help window, unrelated to the current document's content.

• F2 acts on whatever text or object is currently selected, putting it into a movable state.

• F9 acts on whatever field is currently selected, recalculating or refreshing its displayed content.

• F7 opens the Spelling and Grammar pane, matching what the question is asking about.

Result: the key that checks spelling and grammar in MS Word is F7.