Which sentence is not punctuated correctly?

Responses
A People who have no training should not try to jet-ski.People who have no training should not try to jet-ski.
B A pine tree that my father planted fell down in the last storm.A pine tree that my father planted fell down in the last storm.
C All of the cookies, that Marnie made, were eaten in ten minutes.All of the cookies, that Marnie made, were eaten in ten minutes.
D Riley's hair, a rare shade of auburn red, looked stunning for prom.

1 answer

The sentence that is not punctuated correctly is:

C All of the cookies, that Marnie made, were eaten in ten minutes.

The correct punctuation should not include the commas around "that Marnie made." It should read: "All of the cookies that Marnie made were eaten in ten minutes." The phrase "that Marnie made" is essential to the meaning of the sentence, so it should not be set off by commas.