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.
In this sentence, semicolons should be used to separate the different categories of foods to avoid confusion, as the items within each category are separated by commas. A corrected version would look like this:
A well-balanced diet includes root vegetables (such as carrots); dark red fruits (such as strawberries); and whole grains (such as brown rice).
This format clarifies the structure and ensures that the reader understands each distinct category without confusion.