Which sentence is an example of an oxymoron?
a.
the cat purred and stretched its limbs as far as the four corners of the room.
b.
there was a swoosh then a plop when the pot of soup fell on the kitchen floor.
c.
there was a roaring silence outside after the storm swept through the town.
d.
the baby's cries pierced through the walls of the house and woke everyone up.