Why is important to keep the punctuation exact in a

because not having it in its exact citation could get confusing for others

the word that best matches the meaning of the expression "went to the big ocean" is died.

the goldfish died, which is why the father looks at the children mournfully. the "big ocean" is the father's way of saying fish heaven. he could have just said that the goldfish died, but this way, the children imagine the fish in a bigger, better place instead of just picturing a dead fish.

explanation:

the third answer is right : )

i hope this you with your work! : )