Ive never read about this, but looking at a summary I would say B.
<span>the factors for 20 are 1, 2, 4, 5, 10, and 20 and the factors for 249 are 1, 3, 83, and 249. so the only numbers that can go in evenly are 1</span>
sports ,clubs ........................
Answer is B. While the language he used was still considered modern English, he invented his own words which makes it confusing to understand for modern students.