Commas in a Series

What change needs to be made to this sentence: Either blueberries, grapes or plums stained the front of the new jacket? Options: Remove the comma after blueberries, Add a comma after grapes, Add a comma after plums, No change needed

Crows bats, and bumblebees make Justin Bieber wish he could fly. What change needs to be made to this sentence? Options: Add a comma after Crows, Remove the comma after bats, Add a comma after bumblebees, No change needed

What change needs to be made to this sentence: Enya plans to write a song, swim with the dolphins, and visit an active volcano before her next birthday?

What change needs to be made to this sentence: He didn't know whether his guests wanted roast beef tuna casserole or burgers for lunch?

Which sentence uses commas correctly? Options: I wanted to buy cookies chips and, candy., I wanted to buy cookies chips and candy., I wanted to buy cookies, chips, and candy.

Which sentence uses commas correctly? Options: Sally is sweet, pretty, and nice., Sally is sweet, pretty, and, nice,., Sally is sweet pretty and nice.

Which sentence uses commas correctly? Options: Do not run, jump, or skip, in the hall., Do not run, jump or skip in the hall., Do not run, jump, or skip in the hall.

Which sentence uses commas correctly?
Options:

My friends are Chris, Alex, and Denise.

My friends are Chris Alex, and Denise.

My friends are Chris Alex and Denise.

Which sentence uses commas correctly?
Options:

We use pencils crayons and paper at school.

We use pencils, crayons, and paper at school.

We use ,pencils ,crayons ,and paper at school.

Which sentence uses commas correctly?
Options:

A frog, a rabbit, and a duck are friends in this fable.

A frog a rabbit and a duck are friends in this fable.

A frog, a rabit and a duck are friends in this fable.