Fusion processes, like combining two deuterons to form a He nucleus are impossible at ordinary temperatures and pressure.The reasons for this can be traced to the fact

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nuclei are positively charged

the original nuclei must first break up before combining with
each other

nuclear forces have short range

the original nuclei must be completely ionized before fusion
can take place

answer is A, B.

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Detailed Solution

Fusion processes are impossible at ordinary temperatures and pressures. The reason is nuclei are positively charged and nuclear forces are short range strongest forces.At high temperature, average kinetic energy of duterons is very high . This high kinetic energy enables two duterons to come close to each other so that they can interact with each other through strong nuclear force .

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