Answer:
Statement B. You have to be cruel to be kind is an example of a paradox.
Explanation:
In general terms, a paradox is a situation or statement that contains two opposite elements, and therefore it is difficult to understand. As a literary device, a paradox is the juxtaposition of seemingly contradictory concepts -in this case, cruel and kind- that usually reveals a hidden or unexpected truth. Generally, the hidden truth can be fully understood once the reader thinks more deeply about the meaning of the juxtaposition.