Which reasoning is evident when someone believes that solving a specific issue will eliminate all their broader business problems?

Causal oversimplification refers to the reasoning error where an individual attributes a complex problem to a single cause, believing that solving this one specific issue will resolve all related or broader issues. This type of reasoning fails to acknowledge the complexity of the situations and the multitude of factors that contribute to both the specific and the broader problems at hand.

In the context of a business setting, if someone assumes that addressing a singular challenge will automatically lead to the resolution of all operational, financial, or strategic difficulties, they are simplifying the relationship between cause and effect. This perspective ignores the possibility that multiple interrelated challenges might exist, each requiring attention and resolution on its own.

The other alternatives do not accurately capture this reasoning. Wishful thinking represents a belief in a desired outcome without foundation, prejudice involves preconceived opinions or biases that are not based on reason or actual experience, and "No Technique" implies a lack of reasoning method entirely, which doesn't address the cause-and-effect misjudgment in question. Thus, causal oversimplification is the most fitting description of the reasoning in the scenario presented.