Last year , when I stopped carrying an umbrella it rained so rarely , my allergies were hardly noticeable . This year , uh . Mold is # 1 with a bullet on the allergy list ( dust is # 2 ) , although there are also some autumn spores that get me .
According to the above context, choose the best option to answer the following question.
Question: Why is mold # 1 with a bullet on the allergy list ?
Options:
- None of the above choices .
 - Because it rained so rarely .
 - Because mold activates the writer 's allergies .
 - Because it was last year .


Because mold activates the writer 's allergies .