My cat eats many things, treats, tuna, and centipedes.
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things: treats,
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things: treats
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things; treats,
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no change
A
Correct answer
Explanation
A colon should be used to introduce a list that clarifies or explains the preceding independent clause. In this case, "treats, tuna, and centipedes" is a list of the "many things" the cat eats, so a colon is appropriate after "things."