Correct option is B
Option (b) is the correct meaning of the given idiom.
In the heat of the moment: It refers to doing or saying something impulsively or emotionally, typically without thinking due to the intensity of the situation. (जोश में आकर कुछ कर देना)
Example: He didn’t mean what he said; he just said it in the heat of the moment.
Other related idioms and their meanings:
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Lose your cool – To become angry or upset.
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Go off the rails – To behave in an uncontrolled or unacceptable way.
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Blow your top – To lose one’s temper suddenly.