English help

In the sentense below, would it be incorrect to use a comma after sharp? I think it is, but the answer says that a comma after sharp is needed.
“The group of bikers in sharp, neon green jerseys waved at us.”

For coordinating adjectives is a comma used if “and” can be inserted and the sentense makes sense, even if the sentense would not make sense if the two adjectives were reversed. Or is a comma only used if the adjectives can be interchanged in order AND the sentense makes sense when “and” can be placed between the adjectives.

Is the question asking specifically about the comma?

Yes

Can you post the whole question and all of the answers, word for word? It’s hard to answer without proper context for the sentence.

@bodangles Posting the whole question isn’t necessary! This sentence is fine:)

Yes, the comma is needed. Whenever you have two adjectives describing one object, a comma is necessary.

For the example that you mentioned, a comma is necessary because the jerseys have two adjectives! (Sharp and neon green)

Hope this helped!

@DreamforIvy More complete context is never a bad thing. If I myself were writing the sentence, I wouldn’t have put the comma there, because I would never write “The group of bikers in neon green, sharp jerseys waved at us.”

@bodangles That sentence is correct as well. Yes, it’s not how we would normally speak, but it’s correct.

@DreamforIvy Look, at a certain level native speakers refer not to rules but to “This doesn’t sound right to me.” Neither of the sentences with that comma sound right to me, and I want the full question so I can tell if that’s personal preference or grammatical rule.

@bodangles “at a certain level?” And what level may that be? That sentence is a grammatical rule. Almost NEVER (literally 1% of the time) will the ACT choose personal preference over grammatical rule.

Ex: He rode the big, brown horse. (Two adjectives for same object)

Ex: He wore the green football helmet. (No comma necessary because “football helmet” is one thing.)

@DreamforIvy At the level of * being native speakers*, and in my case being a creative writer since I was seven. I’m not disputing that the given answer may be correct. I’m saying that without a complete picture of the question, it is irresponsible to say for sure one way or another.

@parent8768 And maybe mention what test prep source you got the question from? I googled it but was unable to find it.

@DreamforIvy - what special expertise d o you have that allows you to determine what a very established participant on this site needs to properly answer a question? Sorry, that was sarcastic and I for one completely agree with the @bodangles comment above