At the first performance of Edward Elgar's "Enigma Variations," the critics praised it as a masterpiece of form and orchestration A. but were irritated that Elgar did not reveal the "enigma." B. but had to leave early and so were not able to hear the whole piece. C. but wanted to hear it again just to be sure.​

C

but wanted to hear it again just to be sure

the answer is c, because they are being narrated.

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.