The 3 different types of irony: verbal, situational, and dramatic

Verbal- is a figure of speech. The speaker intends to be understood as meaning something that contrasts with the literal or usual meaning of what he says; sarcasm.

Situational-  it occurs when the opposite of what the reader expects to happen, happens.

Dramatic- when the readers knows or understands something that the characters don't.

what is the question that you are asking

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.