Final answer:
The sentence that is an example of first-person narrative is B. I never knew that I could be so happy.
Step-by-step explanation:
The sentence that is an example of first-person narrative is B. I never knew that I could be so happy. First-person narrative uses pronouns such as 'I', 'me', and 'myself' to tell the story from the perspective of the narrator. In this sentence, the word 'I' indicates that the narrator is telling their own personal experience of feeling happy.
Learn more about first-person narrative