Please help me with the question y’all I really had a bad day today and I’m just really trying to pass my assignments please just one question please y’all

Plz heeeeeeelp plz give me the answer

Which expression shows the sum of the polynomials with like terms grouped together

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15