Which sentence uses dashes correctly?



 
A.
Cheddar cheese and—a sliced pickle—make a tasty sandwich.


 
B.
Potatoes for the soup are washed and peeled—ready to be sliced.


 
C.
Nelson—my dog—chases squirrels—and then naps in the sun.


 
D.
"Should I add this—?" he began as the egg rolled off the counter.