"diction" means word choice, aka the words that one chooses when writing or speaking. choice A uses this word correctly, because if you know more words, you'll be able to use "good diction" aka you'll have more words to choose from.
Answer:
C. The incarnation of Mr.Hyde turns Dr. Jekyll into an evil person who seeks only his own pleasures.
Explanation:
Mr. Hyde is an evil nature person. He is smaller in height from Mr.Jekyll but he wants to be dominant on Mr.Jekyll. The Hyde is mysterious and violent person but Mr.Jekyll is Friendly and calm person. He is less powered and weak person whereas Mr.Hyde is strong and powerful person.