I think it’s A, not sure though. have a nice day
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Answer:
B) heighten the impact of the phrase
Explanation:
The em dash acts as a pause for the reader, emphasizing the next phrase by isolating it in the conclusion sentence.
hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon, radon, bromine, carbon, phosphorus, sulfur, selenium, and iodine
