A deuterated compound was used in the given reaction. Explain why it is utilized.

• A. It is utilized to prevent side reactions by stabilizing reactive intermediates.
• B. It is utilized to serve as an isotopic label for tracking atomic or group migration.
• C. It is utilized to increase the rate of the sigmatropic rearrangement.
• D. It is utilized to change the type of products formed in the reaction.

Answer: (B)