What does incorrigible describe?

The term "incorrigible" specifically refers to a person or behavior that is unable to be corrected, reformed, or improved. It often describes someone who is persistent in undesirable or bad habits despite attempts to change them. Thus, when something is termed incorrigible, it highlights an inherent resistance to change or reformation.

In contrast, the other options provide definitions that do not align with the meaning of "incorrigible." For example, describing something as capable of being easily fixed suggests a positive quality and implies it can be changed or improved, which directly contradicts the definition of incorrigible. Similarly, incurring additional effort and requiring immediate attention relate to concepts of effort and urgency, which are not relevant to the idea of being unchangeable or unreformable. Hence, option C accurately captures the essence of the term.