Durga lives in a village and cooks food on a chulha (earthern stove) using wood or cow dung cakes as fuel. She has been suffering from severe cough for the last three months. This may be due to the (CTET Jan 2011)

• A. smoke produced by burning fuel which may have caused her a allergy
• B. old age and pollution Inside and outside her hut
• C. carbon monoxide produced by burning fuel which may have been deposited in her respiratory tract
• D. soot produced by burning the fuel which may have been deposited in her respiratory tract