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It was not until Tracy was halfway back to Manhattan that the audacity of what she had done struck her. She giggled, and the giggle turned into a shaking, uncontrollable laughter, until she finally had to pull the car off onto the side of the road. She laughed until the tears streamed down her face. It was the first time she had laughed in a year. It felt wonderful.
Based on the text above, choose the correct option.