Which sentence is not punctuated correctly?

A) 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.
C) 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.

B?

No, not B.

https://owl.english.purdue.edu/owl/resource/607/05/
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Yes, C is not punctuated correctly. No commas are needed there.

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To determine which sentence is not punctuated correctly, we need to analyze each option and identify any errors. Here's a breakdown of each sentence and its punctuation:

A) "People who have no training should not try to jet-ski."
This sentence appears to be punctuated correctly. It starts with a capital letter, ends with a period, and there are no apparent errors in the punctuation within the sentence.

B) "A pine tree that my father planted fell down in the last storm."
This sentence also appears to be punctuated correctly. It starts with a capital letter, ends with a period, and there are no apparent errors in the punctuation within the sentence.

C) "All of the cookies, that Marnie made, were eaten in ten minutes."
In this sentence, there is a problem with the punctuation. The phrase "that Marnie made" is an essential part of the sentence and should not be set off by commas. Therefore, the correct version would be: "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."
This sentence also seems to be punctuated correctly. It starts with a capital letter, ends with a period, and the use of commas is appropriate to provide additional information about Riley's hair.

Based on this analysis, the sentence that is not punctuated correctly is option C) "All of the cookies, that Marnie made, were eaten in ten minutes."