Maybi have to full workings for this please

13 C NMR Spectroscopy 14.39 Identify each of the C4H10O isomers on the basis of their 13C NMR spectra: (a) 18.9(CH3) (two carbons) 30.8(CH) (one carbon) 69.4(CH2) (one carbon) (b) 10.0(CH3) 822.7(CH3) 832.0(CH2) 869.2(CH) (c) 631.2(CH3) (three carbons) 868.9 (C) (one carbon)