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Answer:
The sentance that contains a metaphor is, "Grandma said life is a roller coaster with lots of loops and dips."
Explanation:
From the sentences given, the one that contains a metaphor is: Grandma said life is a roller coaster with lots of loops and dips.
What is metaphor?
Metaphor refers to a figure of speech that is used to compare two things. The two things being compared are not alike but actually share somethings in common in some way.
We can see that Grandma compares life to a roller coaster.
Learn more about metaphor on https://brainly.com/question/9418370