Question

fix the pronoun error (if one exists).
black widow bought each of the video games as soon as they were released.
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Explanation:

The pronoun "they" refers to "each of the video games", which is a singular noun phrase. To fix the agreement error, we replace the plural pronoun "they" with the singular pronoun "it".

Answer:

Black Widow bought each of the video games as soon as it was released.