The statements with use the rhetorical device of understatement are the ones that begins with "The solution..." and "We do not need...", options B and C.
Understatement as a rhetorical device
We can usually define understatement as saying something in a way that makes it seem less serious or important that what it really is. As a rhetorical device, understatement can come in the form of giving vain and simple solutions to big problems.
That is what we have in options B and C. Both sentences make it seem as if solving problems related to pollution and food insecurity is something simple and fast.
With the information above in mind, we can select options B and C as the correct answers.
Learn more about rhetorical devices here:
https://brainly.com/question/518481
