B.15 1/12;You just add 6+8=14,then you add 1/3+3/4,but you have to find a common denominator,it would be 12,now rewrite and it would be 4/12+9/12=13/12,we can’t have a numerator bigger than the denominator so divide 13/12=1 1/12,then you add that to 14 and it would be 15 1/12.