Task: Question Answering
Input (English): Storm chasers are people who get close to storms in order to observe them and take measurements. What knowledge have storm chasers added to the study of storms that has helped most modify theories of storm formation?  
 (A) their views of storm damages (B) their personal experiences in storms (C) their data collected at the beginning of storms (D) their enthusiasm for studying different storms
Output (English): C