Starting material A with the following signals in 1H NMR spectrum: 1.5 (d, 3H), 3.5 (septet, 0.5H) was reacted with magnesium in diethyl ether to produce compound B which was immediately reacted with benzaldehyde in diethyl ether followed by dilute HCl to produce product C as a racemic mixture. What is the most likely 1H NMR description for the product C

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