Here are the answers to your questions:
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C.how Nina feels about being on stage - Since the story is narrated from Lucian's point of view, readers do not have access to Nina's internal thoughts or feelings, including how she feels about performing on stage.
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B.The author calls the narrator "he." - This indicates a third-person point of view, as it refers to the character using third-person pronouns instead of first-person.
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D.Lucian is shocked to see Nina on stage. - The first paragraph illustrates Lucian's surprise and disbelief that Nina is performing, which aligns with option D.