Which of the following requires commas?

Which of the following requires commas?
 
  a. a series
  b. a three-or-more-item series
  c. a list
  d. all of the above

---

Ques. 2

Lists add variety to sentences, and they also can add necessary information to
 
  a. explain ideas.
  b. illustrate ideas.
  c. clarify ideas.
  d. all of the above.

---

Ques. 3

Lists have to be added at the end of a sentence.
 
  a. True
  b. False

---

Ques. 4

For each of the following sentences, pick the best list to complete the sentence properly.
  Hobbies such as ____ are great for the brain.
 
  a. reading books, playing Scrabble, completing crossword puzzles
  b. reading books, playing Scrabble, and completing crossword puzzles
  c. reading books, playing Scrabble and completing crossword puzzles

---

Ques. 5

For each of the following sentences, pick the best list to complete the sentence properly.
  For exercise, my favorite activities are ____.
 
  a. biking and swimming
  b. biking, and swimming
  c. biking, swimming, jogging

---

Ques. 6

For each of the following sentences, pick the best list to complete the sentence properly.
  ____ are music delivery systems of the past.
 
  a. Eight-track cartridges, and record albums, and cassette tapes
  b. Eight-track cartridges, record albums, and cassette tapes
  c. Eight-track cartridges and record albums and cassette tapes