Read the following context and choose the best option to answer the question.
Context: I decided that since school starts here tomorrow , it 's time to change my theme from summer to school . It wo n't be long and I 'll be putting up my fall themes . It 's kind of weird to see it getting dark so early . I always think back to Independence Day and it seems to take forever for the sky to get dark enough for fireworks .
Question: Why is the narrator changing their theme ?
Options: 
- None of the above choices .
 - Fall is over .
 - School is done .
 - Summer is over .


Summer is over .