The given bar graph shows the number of wickets taken by a player X from the year 2016 to 2021. Study the graph carefully and answer the given question.
Find the ratio of number of wickets taken by the player in years 2017 and 2021 together to 2016 and 2019 together.
A3 : 5
B4 : 7
C7 : 9
D5 : 9
helllo?