JEE Main 2021 Chemistry question

Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of with cryolite. Reason (R) : The oxidation state of Al in cryolite is +3. In the light of the above statements, choose the most appropriate answer from the options given below :

• (A)(A) is true but (R) is false
• (B)(A) is false but (R) is true.
• (C)Both (A) and (R) are correct and (R) is the correct explanation of (A)Correct
• (D)Both (A) and (R) are correct but (R) is not the correct explanation of (A)