Which compound produces only one triplet and one quartet in its 1H^1\text{H}1H NMR spectrum?
CH3CH2COCH2CH3\text{CH}_3\text{CH}_2\text{COCH}_2\text{CH}_3CH3CH2COCH2CH3
CH3CH2COOCH2CH3\text{CH}_3\text{CH}_2\text{COOCH}_2\text{CH}_3CH3CH2COOCH2CH3
CH3CH2COOCH3\text{CH}_3\text{CH}_2\text{COOCH}_3CH3CH2COOCH3
CH3CH2CH2OH\text{CH}_3\text{CH}_2\text{CH}_2\text{OH}CH3CH2CH2OH