A)Summer produce, such as heirloom tomatoes, can be used to create delicious salads.
Sentence A is written correctly because it uses commas around the appositive phrase "such as heirloom tomatoes". When commas are used to offset a descriptive phrase from the rest of the sentence, you should be able to read the sentence without the information inside the commas without creating any grammatical errors or changing the meaning of the sentence. Option B is wrong because it separates the subject and verb. Option C is wrong because commas are not used around prepositional phrases. They are only used with prepositional phrases when they are introductory. Option D is also wrong because the commas are not needed.
