What is IUPAC name of hydroquinone?

Hydroquinone is a benzene derivative with hydroxyl groups at para positions. Assigning the lowest locants puts these at carbons 1 and 4.

Standard benzenediol nomenclature identifies this as benzene-1,4-diol:

$\text{Catechol} = \text{benzene-1,2-diol}$
$\text{Resorcinol} = \text{benzene-1,3-diol}$
$\text{Hydroquinone} = \text{benzene-1,4-diol}$
$\text{Phloroglucinol} = \text{benzene-1,3,5-triol}$

The correct IUPAC name corresponds to option $\boxed{C}$.