Which of the following words is used to indicate the act of attributing a cause or quality?

The term that indicates the act of attributing a cause or quality is "ascribe." This word derives from the Latin root 'ascribere,' which means to assign or attribute. In various contexts, ascribing is often used to clarify the relationship between an action and its source or quality. For example, one might ascribe a person's behavior to their upbringing or ascribe a particular quality to a piece of art.

In contrast, "avow" means to declare openly or acknowledge, often in a context related to admission or affirmation. "Broach" refers to introducing a topic for discussion, while "aspersion" typically involves making derogatory remarks or casting doubt on someone. Therefore, while these other terms possess their own distinct meanings, "ascribe" specifically conveys the notion of attributing characteristics or causes, affirming its position as the most accurate choice in this context.