I’m pretty sure it’s B) tightly
Answer: It would fly open, then the floods would rush forward and will come upon you with omnipotent power
Explanation:
A serpent and an elephant. It was a town of machinery and tall chimneys, out of which interminable [unending] serpents of smoke trailed themselves for ever and ever, and never got uncoiled. It had a black canal in it, and a river that ran purple with ill-smelling dye, and vast piles of building full of windows where there was a rattling and a trembling all day long, and where the piston of the steam-engine worked monotonously up and down, like the head of an elephant in a state of melancholy madness.
The figurative meaning of the phrase “set the wall between us” in the poem “Mending Wall” is to build a barrier between people. This figurative is taken from the "Mending Wall" poem by Robert Frost which specifically made to criticize the customs of setting a barrier between people. This part shows the poet messages.