The average cost of a long-distance call in the USA in 1985 was 56 cents per minute, and the average cost of a long-distance call in the USA in 2018 was 2 cents per minute. Find the approximate percent decrease in the cost per minute of a long- distance call. (adapted from 2007 AMC 8, Question \#6) 
选项为:A:$$90$$  B:$$95$$  C:$$96$$  D:$$97$$  E:$$98$$  请回答其中一个选项.