Which of the following initiators can be used for anionic chain-growth polymerization?

Name: Which of the following initiators can be used for anionic chain-growth polymerization?
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Question

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B is a lithium-based initiator, which is commonly used for anionic chain-growth polymerization. A is a radical initiator used for free-radical polymerization, C is not a known initiator, and D is a Ziegler-Natta catalyst used for olefin polymerization.

Which of the Following Initiators Can Be Used for Anionic