Which of the following best describes "exculpate"?

The term "exculpate" specifically refers to the act of absolving someone from blame or fault, effectively freeing them from accusations or guilt. In legal and moral contexts, it is often used to describe scenarios where an individual is cleared of wrongdoing. This directly aligns with the definition of "exculpate," making it the best choice for this question.

The other options do not capture the meaning of "exculpate." Making improvements or corrections refers to adjusting something to enhance it, which is unrelated to blame. Decreasing importance or severity involves downplaying something rather than absolving responsibility. Discovering or finding out pertains to obtaining knowledge or information, which is also distinct from the concept of absolving blame. Thus, the choice that accurately encapsulates the meaning of "exculpate" is to absolve from blame.