hai...stuck ..it simple but i still stuck. hope some one give me guide line how to solve

Question:

A coin is tossed three times.Ais the event ' at least two tails' ,Bisthe event 'three heads or three tails,Cis the event 'at least one tail. Which of the following are independent?

(a) A and B

(b) A and C

(c) B and C

solution:

(a) yes

(b) no

(c) no

so how to prove the ans