Answer this for points and brainilest (work must be included)

Which one ? is the answer and how to find this answer

Find the value of x. give reasons to justify your solutions! l, m ∈ kn

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?