Read the following context and choose the best option to answer the question.
Context: Chapter 1It was nearly dark out when Manny heard a mysterious rustling noise outside his bedroom window . Manny tapped his pencil on his desk and tried turning back to his homework . There it was again !
Question: Why is Manny unable to focus on his work ?
Options: 
- Manny has ADHD .
 - None of the above choices .
 - Manny hears strange sounds .
 - Manny smells something weird .


Manny hears strange sounds .