Question

if the blue text contains an error, click to fix it.
my grandmother tells the best stories. last year, she
and miles morales started writing them down to
make them into a book.

Explanation:

The blue text has a pronoun consistency error. The sentence refers to "my grandmother", so the third-person singular feminine possessive pronoun should be used to show the stories belong to her, instead of the subject pronoun "she".

Answer:

Change "she" to "her" so the sentence reads: "My grandmother tells the best stories. Last year, her and Miles Morales started writing them down to make them into a book."