What's the correct option?

The tree diagram below shows the probabilities for the simple events combining weather patterns and seasons of the year. Find the probability of it being spring, given that the day is not sunny. 50 Sunny (.125) Spring 50 Cloudy (.125) .25 90 Sunny (.225) 25 - Summer 10 Cloudy (.025) 25 60 Sunny (.150) Fall 40 Cloudy (.100) .25 20 Sunny (.050) Winter 80 Cloudy (.200) O .55 O.278 .227 1-.227