Read the excerpt from “tears of autumn.”

the early morning mist had become a light chilling rain, and on the pier black umbrellas bobbed here and there, making the task of recognition even harder.
how does this excerpt from "tears of autumn" develop the setting of the story?

a the rain and bobbing black umbrellas add to the mystery surrounding taro.
b it adds to the uncertainty about what hana's life will be like in america.
c it demonstrates the cold and dreary weather of san francisco.
d the rain and chill in the air reflects the gloomy mood of the story.