Correct Answer: Saying or doing something without thinking due to anger

Solution : The first option is the correct answer.

In the heat of the moment refers to a period of strong emotion, often when one is upset, angry, or emotionally charged. During such moments, people may act impulsively or say things without careful consideration.

The phrase implies a lack of rational thinking or a temporary loss of control due to heightened emotions.

Therefore, the correct answer is saying or doing something without thinking due to anger.