What is the act of "repudiating" something?

The act of "repudiating" something refers specifically to the action of disowning or rejecting it. This term is often used in contexts where an individual or entity makes a clear statement against something they previously accepted, believed, or were connected to. By repudiating, one is essentially distancing themselves from the subject, establishing a stance of disapproval or denial.

In this case, repudiating does not involve embracing, supporting, acknowledging, or promoting something's validity, which are the concepts presented in the other choices. Instead, it is the direct opposite, focusing on a decisive separation or rejection of a previously held position or belief. This understanding solidifies the choice of the correct answer.