When an author's purpose is to the author attempts to convince the reader of his or her point of view

It would be to persuade if you remember PIE (persuade, inform entertain).

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 one.

hope it