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Fusion reaction takes place at high temperature because

1. nuclei break up at high temperature
2. atoms get ionised at high temperature
3. kinetic energy is high enough to overcome the coulomb repulsion between nuclei
4. molecules break up at high temperature

Correct answer: kinetic energy is high enough to overcome the coulomb repulsion between nuclei

Solution

Fusion reactions require extremely high temperatures to provide nuclei with sufficient kinetic energy to overcome the electrostatic repulsion (Coulomb barrier) between them, allowing them to come close enough for the strong nuclear force to bind them together.

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