Which file extension is used for an MS-Word file?

A.jpg

B.mp3

C.mov

D.docx ✓ Correct

Correct answer: (D) .docx

Explanation

An MS-Word file uses the .docx extension, the default format for Word documents since 2007.

The .jpg extension is for compressed image files, not word-processing documents.

The .mp3 extension is for compressed audio files such as music.

The .mov extension is for video files, chiefly the QuickTime format.

Only .docx among these marks a text document created in Microsoft Word.

The older Word format used .doc, which the XML-based .docx later replaced.

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