Which sentence best defines parallel structure at the sentence level?
two or more phrases in a sentence are the same length.
two or more parts of a sentence are connected by a conjunction.
two or more parts of a sentence have the same grammatical form.
two or more words in a sentence have the same pattern of syllables.

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:

search it up on google or think from your brain make it work harder.