Chronic asthma soa

A 27-year-old patient presents with a history of nocturnal and seasonal chronic cough. She denies wheezing or dyspnea. She also reports that her cough worsens with cold air exposure. Physical examination reveals no abnormalities. What is the next best step in managing this patient's condition?

1: Start treatment with an inhaled corticosteroid.
2: Prescribe an oral proton-pump inhibitor.
3: Initiate therapy with intranasal glucocorticoids and oral antihistamines.
4: Perform spirometry and consider a bronchodilator challenge.