To form an interrogative negative question, may use this structure: He isn't rich. --> negative

Isn't he rich? --> interrogative question

or should I use: Is he not rich? --> interrogative question

Which one is correct?

Thanks for helping me :)

Which statement best describes the effect of the metaphor on the excerpt's meaning? o a. it compares the sloshing liquid to a river of water able to push apart the sidewalk o b. it makes the frozen crystals seem like friends to the city to contrast with what a deceitful foe they are. o c. it compares the frozen crystals to delicately lacy snowflakes having arn unexpected strength o d. it likens h20 molecules to hexagonal crystals, which are actually larger than people imagine.