Excitement, should be the answer! I cannot tell much more because there is not much context. I hope you pass your exam, though :>
Given the conditions, the closest answer would be conventions. Word choice is using colorful language such as heavy adjectives and replacement of better words. Sentence fluency deals with fragment sentences or run-ons. Ideas deal with the main topic of an article or essay, etc.
Answer: The answer is D. A person witnesses a double rainbow, which suggests bad times ahead.
Explanation: