Read the following article and answer the question by choosing from the options.

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 .

Why is the narrator changing their theme ?
Choose from: [I] None of the above choices . [II] Fall is over . [III] School is done . [IV] Summer is over ....A:
[IV]