Four option are provided as,
CH3CH2OCH2CH3
CH3CH2Cl
CH3CH2CH3
CH3OCH2CH2OCH3
CH3CH2Cl having 2 peaks of H NMR as 1st peak for quartet of 2 H and 2nd peak of triplet of 3 H and thus the ratio of both the peak is 2 :3 as the ratio indicates the number of hydrogen corresponds to each peak.