Which phrase from the text creates a sense of dread for the approaching King Pluto?

There came a rumbling noise out of its depths, louder and louder, and nearer and nearer
There they were, tossing their black manes and flourishing their black tails
Her voice was too quiet to be heard by anyone other than the richly dressed man
Ceres was then a thousand miles off, making the corn grow in some far distant country