Which of the following sentences is missing a hyphen?
O
A. I had to jump-start my car this morning.
B. The machine-gun sound of the nail gun was disconcerting.
O
C. My friend wants to be a stand-up comedian when she graduates.
O
D. That run down shack should be condemned.

Here's the answer to the best of my ability..

You're asking for what sentence is missing a hyphen and I see nothing wrong with the one sentence that doesn't have a hyphen.

But if you're asking for what sentence is using a hyphen incorrectly then option B is your answer because machine gun doesn't need a hyphen.

If you're asking which sentences are using the hyphen correctly then option's A, and C are your answer.

If you're the question you asked has no mistakes then the best answer would be option D because that's the only option without a hyphen.

Hope this helps.

halibut, flounder, tuna, and trout are all fish. so your first answer is 1.) fish. and since fish is edible, your next answer would be 3). edible

to describe those fishes more thoroughly, some of those fishes live in fresh water, and some of the fishes live in salt water, and that is not a thing that they all have in common. the question is asking what is common with all of the fish, so answer choices 2). fresh water and 4). salt water are not right.