Study the following bar graph that shows the number of students enrolled for different courses in institutes A and B during 5 years, and answer the question that follows.
What is the ratio of the total numbers of students enrolled in A during 2017 and 2018 to that of students enrolled in B during 2014 and 2015?
1
34 ∶ 39
2
17 ∶ 39
3
39 ∶ 17
4
39 ∶ 34