Answer:
Cheerful
Explanation:
Sullen means gloomy or in a bad mood. However, cheerful is the opposite (or an antonym) becuase it is an adjective that means to be happy and in a good mood.
Choice a : Explains what the nations need to do and elaborates some.
--wrong answers--
Choice b only gives a statement of what the nations need to do.
Choice c is a question.
Answer:
c) It helps me visualize what the author is describing.
Explanation:
