The correct option is D In short, every emotion word you learn is a new tool for future emotional intelligence.
The main idea of the given paragraph is that you can improve your emotional intelligence by learning new emotion words. Each emotion word learnt helps your brain to construct new emotional experiences and improves your perception of other people’s emotions.
Option (D) is the best one to complete the given paragraph as it sums up the main idea.
Option (A) brings up a new idea—that people use the same emotion words to mean different things. Hence, it is not a good option to complete the paragraph.
Option (C), too, is ruled out for the same reason. The paragraph merely talks of increasing your emotion vocabulary, not of learning foreign languages.
Option (B) does not touch upon emotion vocabulary, which is the main point of the paragraph.
Correct Answer: Choice (D)