Propose a molecule that exhibits the following proton NMR data: C4H8O 1.33 ppm (6H, singlet) 2.64 ppm (2H, singlet) No IR peak at 1700 cm -1 and no IR peak at 3390 cm -1 Group of answer choices t-butyl alcohol 2,2-dimethyl epoxide 2-methylpropanone 2-methylpropanal