Fix any punctuation or capitalization errors below. Click "Submit Answer" if there
are none.
The blue sneakers were Queen Elsa's favorite, they
were also the most expensive item in the store.
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 The blue sneakers were Queen Elsa's favorite; they

were also the most expensive item in the store.  or

The blue sneakers were Queen Elsa's favorite, but they

were also the most expensive item in the store.   or

The blue sneakers were Queen Elsa's favorite. They

were also the most expensive item in the store.

Explanation:

The error in the original sentence is called a "comma splice."  You have two independent clauses. As they are closely connected, you may use a semicolon between the clauses, or you may use a comma and a coordinating conjunction.

Most commonly, use a period and a capital letter to make two separate sentences.

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