Answer:
(C) A school nurse often misses work because she has an unhealthy lifestyle.
Step-by-step explanation:
Ironies are those situations or anything that is the opposite of just what a thing or someone is supposed to be. It is deliberately contrary to the thing expected and most times, it is hilarious.
From the above provided options, option (C) shows the best irony. the sentence shows a school nurse who had to miss work due to being almost always sick herself.
The irony is that she, being a nurse herself, is supposed to be healthy considering the line of work she's doing and what she would have learned. But, ironically, she had to miss a lot of work as she gets sick from her unhealthy lifestyle.