The fusion process is possible at high temperature because at high temperatures :

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The nucleus disintegrates

Molecules disintegrate

Atoms become ionised

The nuclei get sufficient energy so as to overcome the repulsive Coulomb force

answer is D.

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Detailed Solution

Concept- We must address why the fusion process is feasible at high temperatures in this query. For this, we'll pay attention to the specifics of the fusion process and the circumstances in which it can occur.
We must respond to this query by explaining why the fusion process is feasible at high temperatures. For this, we'll pay attention to the specifics of the fusion process and the circumstances in which it can occur.
Hence, option 4 is correct.

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