Which of the following statements is true?

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(C) $1$. For option $A$: $_{78}Pt^{192}$ has $78$ protons and $192 - 78 = 114$ neutrons. Thus,$A$ is false.$2$. For option $B$: In beta decay,the atom

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$_{92}U^{238} 	o _{90}Th^{234} + _{2}He^{4}$

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(C) $1$. For option $A$: $_{78}Pt^{192}$ has $78$ protons and $192 - 78 = 114$ neutrons. Thus,$A$ is false.$2$. For option $B$: In beta decay,the atomic number increases by $1$. $_{84}Po^{214} 	o _{85}At^{214} + \beta^-$. Thus,$B$ is false.$3$. For option $C$: Alpha decay involves the emission of a helium nucleus $(_{2}He^{4})$. The mass number decreases by $4$ and the atomic number decreases by $2$. $_{92}U^{238} 	o _{90}Th^{234} + _{2}He^{4}$. This is a correct alpha decay reaction.$4$. For option $D$: This reaction shows an alpha decay for Thorium,which is incorrect as it should be a beta decay. Thus,$D$ is false.Therefore,the correct statement is $C$.

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