The correct answer is B. Failure.
A fiasco is a complete failure, especially one that is publicly embarrassing. It is a word that is often used to describe a situation that has gone very wrong, and it can be used in a variety of contexts. For example, a business might be described as having a fiasco if it goes bankrupt, or a sporting event might be described as a fiasco if there are many problems with the organization or the execution of the event.
The other options are not synonyms of fiasco. Hope is a feeling of expectation and desire for a certain thing to happen. Failure is the lack of success in an attempt or undertaking. Success is the accomplishment of an aim or purpose. Strength is the quality of being strong.