Choose the sentence in which the appositive or appositive phrase is essential to the sentence and punctuated correctly the Keystone Cops popular silent film characters debited in 1912

1. Non-essential - A title usually is the result of hard work, therefore, it's not necessary to include that appositive phrase.

2. Essential - It tells you who the Keystone Corps are. Otherwise, you would have no idea.

3. It's non essential.