The correct answer is B. With items listed in a series.
Explanation
The comma is a punctuation mark that has various uses, including separating two ideas in the same paragraph, enumerating, separating elements in a list, adding an explanation or example, among others. In the sentence "The party was so fun! We ate, danced, and played games" the comma is being used to separate items in a list. So the correct answer is B. With items listed in a series.
