Hyperconjugation is most useful for stabilizing which of the following carbocations?

Hyperconjugation is most useful for stabilizing which of the following carbocations?
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Hyperconjugation is most useful for stabilizing which of the following carbocations? A. Neopentyl B. tert-Butyl C. Isopropyl D. Ethyl
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Which one of the following carbocations are most stable?

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Which one of the following carbocations is most stable?

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