1) ACTUALLY → Only one A and one L are present in QUIZZICALITTY. So, cannot be formed. 2) TACITLY → Can be formed. 3) AQUATIC → Only one A is present in QUIZZICALITTY. So, cannot be formed. 4) TACTUAL → Only one A is present in QUIZZICALITTY. So, cannot be formed. Hence, TACITLY is the correct answer.