Answer:
B) Dreams make people happy.
Step-by-step explanation:
In literature, the theme is the message or life truth of a story that the author is trying to convey.
Usually this belief, message, or idea is universal and transcends cultural barriers. It has to apply to not just you, but to people and life in general.
The theme of the poem "Dreams" by Langston Hughes is that dreams make people happy.
We can know that is the theme, because Langston compares a life without dreams to a bird that cannot fly. He compares life without dreams to a barren field frozen with snow. With the metaphors, Langston is saying, that without dreams, people can't be happy or complete.
Take care and have a lovely rest of your day! :)