题目内容：
根据材料回答题：
According to the essay, you may have a cold because___________ A．it is caused by the cold winter weather
B．the spread of rhinoviruses gets people infected
C．another person's coughing passes the cold to you
D．you wash your hands too often
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：