Serene the silver fishes glide, Stern-lipped, and pale, and wonder-eyed!

Which sentence best explains how the lines contribute to the poem's meaning?

A.
The idea of fishes gliding creates an earnest and serious tone.
B.
The description of the fishes' lips makes them seem upset about being in the aquarium.
C.
The fishes' personification makes them seem like they are observers of the world.
D.
The wonder shown by the fishes makes them seem like they are children.