Read this passage from "I Hear America Singing," by Walt Whitman. What poetic technique is Whitman using?

The carpenter singing his as he measures his plank or beam,

The mason singing his as he makes ready for work, or leaves off

work,

The boatman singing what belongs to him in his boat, the

deckhand singing on the steamboat deck,

The shoemaker singing as he sits on his bench, the hatter singing

as he stands,

A. Onomatopoeia

B. Regular Meter

C. Cataloging

D. Rhymes