Read the following context and choose the best option to answer the question.
Context: First let me set my frame of mind up for you all . I have recently been having trouble with my 15 year old son . Nothing too extreme just the typical I am a teen now pulling away from the mom stuff . Breaks my heart that the kids are growing up so fast and I have been trying without success to hang on to his youth .
Question: Why is the narrator upset at their son 's behavior ?
Options: 
- Their being disrespectful .
 - Their committing crimes .
 - Their bullying other youths .
 - Their growing up too fast .


Their growing up too fast .