Task: Question Answering
Input (English): Problem: zachary is helping his younger brother, sterling, learn his multiplication tables. for every question that sterling answers correctly, zachary gives him 3 pieces of candy. for every question that sterling answers incorrectly, zachary takes away two pieces of candy. after 9 questions, if sterling had answered 2 more questions correctly, he would have earned 31 pieces of candy. how many of the 9 questions did zachary answer correctly ?
Options: a. 6, b. 7, c. 8, d. 9, e. 10
Output (English): c