Read this sentence.

The day we chose to go camping was of course the hottest day of the year.

Select the answer that shows the correct punctuation of the parenthetical expression.


A) The day we chose to go camping was of course the hottest day, of the year.


B) The day we chose, to go camping, was of course the hottest day of the year.


C) The day we chose to go camping, was of course the hottest day of the year.


D) The day we chose to go camping was, of course, the hottest day of the year.