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 .

Options:
1). None of the above choices ..
2). Because it rained so rarely ..
3). Because mold activates the writer 's allergies ..
4). Because it was last year ..
Answer the following question: Why is mold # 1 with a bullet on the allergy list ?
3).