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Markovnikov's rule applies to the addition of HX (where X is a halogen) to alkenes. It states that the hydrogen atom of HX will add to the carbon with more hydrogen atoms already attached. Of the given options, only these fit this description:
A. CH2=CH-CH3
B. CH3-CH=CH-CH3
C. CH2=CH2
D. CH3-CH2-CH3 is an alkane and does not have a double bond, so Markovnikov's rule does not apply.