Explanation

(c)
Mixture of anhydrous $ZnCl_{2}$ and conc. HCl is known as Lucas reagent. Lucas test is used for the distinction between primary, secondary and tertiary alcohols.
The tertiary alcohol reacts immediately with Lucas reagent producing turbidity.
The secondary alcohol gives turbidity within 5-10 min and primary alcohol doesn’t give turbidity at all at room temperature. In the given alternates, 2-hydroxy-2-methyl propane is $3{^\circ}$ alcohol, so it is more reactive.