The order of reactivity of following alcohols with halogen acids is ___________.(i) (A) > (B) > (C) (ii) (C) > (B) > (A) (iii) (B) > (A) > (C) (iv) (A) > (C) > (B)

Option (ii) is the answer.

Alcohol reactivity towards halogen acids diminishes in the following order: (C) > (B) > (A)
Because tertiary carbocation is the most stable of the three, it is preferred above primary and secondary carbocation.