Which sentence contains a correctly punctuated parenthetical phrase?

a. by comparison the party, will be a success.

b. therefore he will stay with us.

c. we, however, live across town.

d. as a result of his request she is coming to the party.

Choose a different word from those you selected to study in this unit and explain where you have heard it used previously write this sentence you heard with the vocabulary word in it and include who use the word and when we do used to use proper grammar and spelling