What does the mutual reward theory state?

i's say B but don't quote me on it.

B

Explanation:

"a relationship between two people is enhanced when there is a satisfactory balance of rewards between them."

c hydrophobia is the answer

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: