This is the reasoning used to reach a decision based on a set of assumptions

Logic is the right answer.

Explanation:

Logic is a term which can be explained as reasoning conducted or evaluated following strict laws of validity. In this way, logical can be something that comes from explicit reasoning. Logic plays a significant role in the process of effective thinking. The essential building blocks in logical reasoning are the inferences. Therefore, logic is the reasoning used to relinquish a choice on the basis of a set of theories, or it may be explained as the science of argumentation, thinking, proof or inference.