The correct option is D.
From the passage given above, it can be seen that the author is implying that compulsory voting was implemented in Australian a long time ago and it has has been very successful and that the same method should be used when it comes to voting in America.
It's D second because the reason before the says "One is that..."
Negative, I suppose. Didn't see strong critique herself?
I would say the answer is a metaphor hope this helps:)
To prepare readers for the difficulty of the days that lay ahead.
