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(B) Step $(i)$: Hydration of propyne $(CH_3-C \equiv CH)$ in the presence of $Hg^{2+}$ and $H_2SO_4$ follows Markovnikov's rule to form acetone $(

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(B) Step $(i)$: Hydration of propyne $(CH_3-C \equiv CH)$ in the presence of $Hg^{2+}$ and $H_2SO_4$ follows Markovnikov's rule to form acetone $(CH_3-CO-CH_3)$.
Step $(ii)$: Nucleophilic addition of $HCN$ to acetone forms a cyanohydrin $(CH_3-C(OH)(CN)-CH_3)$.
Step $(iii)$: Catalytic hydrogenation of the cyanohydrin using $H_2/Ni$ reduces the $-CN$ group to a primary amine group $(-CH_2NH_2)$.
The final product $(A)$ is $2-hydroxy-2-methylpropan-1-amine$,which corresponds to the structure shown in option $(B)$.

The product $(A)$ formed in the following reaction sequence is :
$CH_3-C \equiv CH$ $\rightarrow[(ii) HCN]{(i) Hg^{2+}, H_2SO_4}$ $\xrightarrow[(iii) H_2 / Ni]{} (A)$

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The product $(A)$ formed in the following reaction sequence is : $CH_3-C \equiv CH$ $\rightarrow[(ii) HCN]{(i) Hg^{2+}, H_2SO_4}$ $\xrightarrow[(iii) H_2 / Ni]{} (A)$