单选题 For most allergies, the best treatment is elimination of the bothersome substances from the sensitive person's environment.
【正确答案】 C
【答案解析】[词义辨析] bothersome“讨厌的”与C项的irritating“使人不愉快的”含义接近。unnatural“不自然的”；dangerous“危险的”；surrounding“周围的”。