Task: Question Answering
Input (English): Question: The average weight of a group of boys is 30 kg. After a boy of weight 35 kg joins the group, the average weight of the group goes up by 1 kg. Find the number of boys in the group originally ?

 Option A: 4

 Option B: 8

 Option C: 9

 Option D: 2

 Option E: 9
Output (English): Option A