Sir i am stuck for this question

Question 19 Not yet answered Marked out of 1.00 Flag question Three urns contain both blue and white balls. Urn 1 contains one blue and three whites; urn 2 contains three blues and seven whites; and um 3 contains 80 blues and 20 whites. An urn is chosen at random from the three, each with the same probability of being chosen, and a ball is chosen at random from the selected urn, The probability that the chosen ball is blue is: Select one: O a. 84/114 = 0.737 O b. 135/300 = 0.45 O c. 80/300 = 0.267 O d. 84/342 = 0.246