Final answer:
The correct sentence is: Our store includes books, souvenirs, toys, and post cards.
Step-by-step explanation:
The correct sentence is: Our store includes books, souvenirs, toys, and post cards. The sentence is punctuated correctly because it uses commas to separate items in a list and includes a comma before the conjunction 'and' before the last item. This is the standard way to punctuate a list in English.
Learn more about Punctuation in English sentences