The sentence that requires semicolons instead of commas is:
"A well-balanced diet includes root vegetables, such as carrots, dark red fruits, such as strawberries, and whole grains, such as brown rice."
This sentence lists items that each contain commas within them, so using semicolons would make it clearer to separate the main categories.
The correct version would be:
"A well-balanced diet includes root vegetables; such as carrots; dark red fruits; such as strawberries; and whole grains; such as brown rice."
However, note that the provided structure could also use a different format for clarity, specifically:
"A well-balanced diet includes root vegetables (such as carrots), dark red fruits (such as strawberries), and whole grains (such as brown rice)."
This keeps the items clearly separated without confusion.