Here are the matches for each example with the correct fallacy:
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Post hoc: "Mental health concerns have increased with the rise of digital media, so smartphones must cause depression."
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Red herring: "Mrs. Smith is an awful teacher." "She gives us timely and respectful feedback on our assignments," replied Stephen. "Sure, but I bet she gives good grades to her favorite students."
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Ad hoc: "Sure, my grade in math is low, but my team won the state championship last weekend!"
These examples illustrate the respective fallacies they represent.