The correct option is "C". A situational irony refers to a situation in which what was intended to happen has an opposite effect, so the result is contrary to what was expected. It is a literary device that occurs when contradictions appears between what someone expects to happen, but the outcome is completely different.
An example of situational irony: A racing car driver has a fear of speed. This situation is ironic because racing car drivers spend most of their time driving at high speed.