Answer:
D: 8 years
Explanation:
To do this, just make the line of best fit.
For this problem just try to find a line that has the same amount of data points on both sides and goes through the middle.
In this situation 2 ½ of the data points will be on each side.
On average since all data points have more than 1 student from 1 to 5 years, A and B are obviously incorrect.
C is incorrect because on average the number of students decreases by around 10 to 15 every year, so the club will have between 20 and 15 students in 6 years.
Therefore D can only be correct.