Answer:
B. The Hamptons have beaches, restaurants, and parties to keep visitors entertained.
Explanation:
The use of serial commas to separate items in a list is essential because it promotes a better understanding of the information being conveyed in the sentence. The commas used in the sentence above identifies each of the items mentioned as separate sites in the Hamptons.
A combination of any two of the items would make them be viewed as joined together. The second sentence correctly splices each of the items in the list as individual items.