What does the word "qualm" signify?

The term "qualm" refers to a feeling of discomfort or uneasiness, particularly concerning a moral or ethical decision. When someone experiences qualms, they may have reservations or doubts about a certain action, indicating a sense of internal conflict or hesitation. This understanding aligns with the notion that qualms often surface when a person is contemplating actions that may not sit well with their values or beliefs. It highlights a state of concern or uncertainty, making "A. A discomfort or uneasiness about an action" the correct choice.

The other options do not capture this essence: a sense of confidence reflects assurance, a person's decision pertains to choice-making without implying discomfort, and a supportive statement relates to affirming or endorsing someone's views or actions, which is unrelated to the internal struggle implied by qualms.