Hii, Could anyone explain why the answer is C?

[MRSM04-16] The acidity of hydrogen chloride gas cannot be shown when dissolved in the following solvents
I water
II ethanol
III benzene
IV tetra chloromethane
A. I and II only
B. III and IV only
C. I and III only
D. II, III and IV only

Acidity of HCl gas can only be shown when it exists as**ionic form*, whereby it dissociates into H+ ion which is a measure of acidity in pH. I don’t think C is the correct answer (maybe there’s a mistake)? I think D is the correct answer as they are all organic solvents.

Alright, thanks a lot! :grinning_face_with_smiling_eyes: