The phrase “once upon a time” serves as a(n) to a book.
A) Allusion
B) Metaphor
C) Simile
D) Introduction

D. Introduction

Explanation:

The phrase " once upon a time " is an introduction to a book. I hope this answer helped you. I am certain that this is the correct answer.

d an introduction

Explanation:

the audience knows that nora is intentionally failing to dance correctly, but helmer doesnt

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