Which of the following four compounds gives a ¹H NMR spectrum consisting of only a singlet?

Question

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In a ¹H NMR spectrum, only a singlet is observed for hydrogens that are all equivalent. This means that the compound must have a symmetrical structure with all hydrogens in equivalent environments. 2,2-dichloropropane fits this description, as both the carbons in the center of the molecule are equivalent and each have two equivalent hydrogens attached to them. The other compounds have non-equivalent hydrogens due to their asymmetrical structures.

Which of the Following Four Compounds Gives a 1H NMR

Which of the Following Four Compounds Gives a ¹H NMR