1 Caleb Home alone after school. 2 He decided to do his homework, so he ran upstairs. 3 As he was working, he heard the door open. 4 What could that noise be? 5 Caleb decided to slowly walk down the stairs to find out. 6 What would he find? 7 All of the sudden he heard footsteps running towards him! 8 He was relieved to see his dog when he turned around.

Which sentence has punctuation that creates a neutral mood

What could that noise be?
Caleb was home alone after school.
What would he find?
All of a sudden he heard footsteps running towards him!

What could that noise be?