Use the sentence to answer the question. 

We are excited for summer vacation, for we have plans to visit several national parks.

Which comma rule is used in the sentence?

(1 point)
Responses

items in a series
items in a series

apositive
apositive

compound sentence
compound sentence

long introductory element

compound sentence

The comma rule used in the sentence is "long introductory element".

The comma rule used in the sentence is "items in a series". This rule states that a comma is used to separate three or more items in a series to show a logical separation between them. In the sentence, the comma is used to separate the national parks that the speaker plans to visit (several national parks) as they are a series of items.