An Unknown Oxygen Containing Organic Molecule Shows a Parent Peak $\delta$

An unknown oxygen containing organic molecule shows a parent peak in its mass spectrum at m/z 58.There is no measurable uv or visible spectrum.The IR shows strong, sharp absorptions at 2930 cm^-1 and 1725 cm^-1.The ¹H NMR shows a singlet at $\delta$ 2.1 (6H) .Which of the following structures best fits the spectral data?

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