3. Which sentence uses dashes correctly?

A.
Turquoise beads and—a silver medallion—adorn her favorite necklace.

B.
Several birds stayed at the feeder—hoping for a good meal.

C.
"I would not step there if I were—!" she began as I slipped on the wet floor.

D.
My sister—a big fan of the outdoors—walks two miles—every afternoon.