Multi-choice problem: Continue writing the next sentence in this paragraph:

A little girl introduces a video where she will play the piano and sing a song. She begins to play the song on the piano and sing along as she plays. the camera

Choose your answer from:
a). then focuses on a baby seated in a swing with her sister dancing around.;
b). zooms in on her face as she continues to play.;
c). is in her hand as she continues to play and go back and forth.;
d). briefly stops for a bit as she continues to play and sing the song while sitting in the piano chair rocking her foot up and down.;
b).