Answer:

B.

Explanation:

. Add video file.

2. On Home tab use Add Music to add music to the whole clip.

3. Move the vertical cursor on the movie to where you want the music to stop.

4. On Edit tab select Split.

5. Now using mouse cursor select just the audio that runs along the top of the video AFTER your split point.

6. Hit Delete on your keyboard.

You could also do it by reducing the volume of the section of audio after the split to zero.