Peanuts according to Dr Campbell are a 6ful substitute to potato chips
Which of the following reflects the proper punctuation of the above sentence?
Peanuts, according to Dr. Campbell, are a 6ful substitute to potato chips.
Peanuts . . . according to Dr. Campbell . . . are a 6ful substitute to potato chips . . . .
Peanuts: according to Dr. Campbell [are] a 6ful substitute to potato chips .
Peanuts, according to Dr. Campbell, are a 6ful substitute to ...