Which sentences are punctuated correctly?
a)the circus featured four clowns, three acrobats, and a tightrope walker.
b)we will bring a flashlight, sleeping bags and a tent on the camping trip.
c)the recipe calls for two eggs; a cup of flour; salt and baking soda.
d)i wrote poems about my best friends, the queen of england and the tooth fairy.
the flags are blue and white; red, white, and blue; and red, white, and green.