The correct option is C (A) is correct; (R) is incorrect.
Al(OH)3 sure is amphoteric. It can react with both an acid as well as a base:
Al(OH)3+3HCl⟶AlCl3+3H2O
Al(OH)3+3NaOH⟶Na[Al(OH)4]
It is not a H+ donor. Hence assertion is true but the reason is false.