What is the definition of catharsis?

a. the defect of character that brings about the protagonist’s downfall in a tragedy
b. a process in a tragedy in which a character heals, often through a painful realization
c. the final event of extreme misfortune in the dramatic action of a tragedy
d. a difficult choice involving a decision based on values, which challenges one's belief system

B

Explanation:the process of releasing, and thereby providing relief from, strong or repressed emotions so B fits that best "a character heals"

B. a process in a tragedy in which a character heals, often through a painful realization

Explanation:

A cathartic experience is one that gives some type of emotional release. In literature, the character has this release as a result of a painful experience that helps them realize something about themselves. The word comes from the Greeks, it's original meaning purification.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).