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(B) The correct answer is $B$.The given reaction is a nuclear reaction,which can take place only if a proton (a hydrogen nucleus) comes into contact w

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(B) The correct answer is $B$.The given reaction is a nuclear reaction,which can take place only if a proton (a hydrogen nucleus) comes into contact with a lithium nucleus.If the hydrogen is in the molecular form $(H_2)$,the interaction between its electron cloud and the electron cloud of a lithium atom keeps the two nuclei from getting close to each other.Even if isolated protons are used,they must be fired at the $Li$ atom with enough kinetic energy to overcome the electrostatic repulsion between the proton and the $Li$ nucleus. Simply placing solid lithium in a flask of hydrogen gas does not provide the necessary conditions for this nuclear reaction to occur.

When a sample of solid lithium is placed in a flask of hydrogen gas,the following reaction occurs: $_1^1H + {_3^7Li} \to {_2^4He} + {_2^4He}$. This statement is:

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