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Cara and all of her high school friends have social media accounts, but she wonders about the proportion of adults who use social media. She hypothesizes that this proportion would be about $65\%$ and decides that she wants to conduct a study.

What is the minimum number of adults she must include in her study for the results of the significance test to be valid?

A

$100$

B

$65$

C

$30$

D

$29$

E

$16$

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