In the following sequence of reactions,
CH3CH2OH $\xrightarrow{\;P + I_2\;}$ A $\underset{\;\;ether\;\;}{\xrightarrow{Mg}}$ B $\xrightarrow{\;HCHO\;}$ C $\xrightarrow{\;H_2O\;}$ D
the compound ‘D’ is
butanal
n–butyl alcohol
n–propyl alcohol
propanal