1) What is the difference, in dollars, of a share of stock A, between the highest and lowest value?
2) In which year, there was the greatest difference between the values of the share of the stock A and a share of stock B?
3) In which year, the ratio of the value of a share of stock A to the value of a share of stock B the greatest?
(A) 2 : 1
(B) 3 : 1
(C) 5 : 1
(D) 1 : 3