HVZ stands for Hell-Volhard-Zelinsky reaction.
In this reaction, a carboxylic acid having an \(\alpha\)-hydrogen is converted into an \(\alpha\)-halogen substituted acid.
So HVZ reaction involves:
\[
\text{carboxylic acid} \to \alpha\text{-halo acid}
\]
Hence, the correct answer is:
\[
\boxed{(B)}
\]