Answer:
The correct answer is shows a sharp increase between 1986 and 1992.
Step-by-step explanation:
Letter A is incorrect because relatively stable means that the turnout would be the almost same during that period, but from 2000 to 2008 it increased.
B is also incorrect because the graph stops in 2012 and it seemed to keep growing.
D is also incorrect because between 2000 and 2004 the turnout increased.
C is the correct answer because the graph goes up in the indicated period.