Which statements use the rhetorical device of understatement? Select two options.

Without a quick solution to the wildfire, we citizens may be in trouble.
The solution to plastic pollution is to drink tap water.
We do not need a solution right away, since two days is plenty of time to solve global food insecurity.
I know you think that a universal cure for disease is coming soon. Still, it does not seem that way right now.
I have an idea that I think would solve this problem, if only I knew where to share it.