To determine the meaning of "quarrel" in the sentence "They had a quarrel about money," let’s analyze the options:

• A. Argument: A quarrel refers to a heated, angry disagreement between people, which aligns with the definition of an argument (especially a tense one).
• B. Fight: While "fight" can sometimes imply a verbal clash, it more commonly suggests physical conflict, which isn’t indicated here.
• C. Discussion: This is a neutral exchange of ideas, not the angry disagreement implied by "quarrel."
• D. Conversation: A casual or formal talk, not a conflict.

The most precise synonym here is argument.

Answer: A. argument

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