Phenol is more acidic than:

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(D) The methoxy group $(-OCH_3)$ exerts a $+I$ effect and $+M$ effect. The $+I$ effect increases the electron density on the oxygen atom of the $-OH$

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Both $(a)$ and $(c)$

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(D) The methoxy group $(-OCH_3)$ exerts a $+I$ effect and $+M$ effect. The $+I$ effect increases the electron density on the oxygen atom of the $-OH$ group,which destabilizes the phenoxide ion and decreases the acidity of phenol.$o-$Methoxy phenol is less acidic than phenol due to the electron-donating nature of the methoxy group.Acetylene $(C_2H_2)$ is a terminal alkyne with a $pK_a$ of approximately $25$,whereas phenol has a $pK_a$ of approximately $10$. Thus,phenol is significantly more acidic than acetylene.$p-$Nitrophenol is more acidic than phenol due to the strong $-I$ and $-M$ effects of the nitro group,which stabilize the phenoxide ion.

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