Which sentence does not contain any errors in comma usage?

a.
it is, a hexagonal, traffic sign.

b.
jeremy has an old red wagon.

c.
the antique, and enormous clock stands in our living room.

d.
the stereo was designed with four, large speakers.

This question is obviously focused on commas, so if you say these sentences out loud and use breaks after every comma, you can tell which sentence doesn't make sense. So the answer is (d.).

explanation:

if you’re a fan of chocolate, every occasion is right for this treat. feeling down? eat some chocolate. celebrating? eat some more. want to show your valentine how special you think your sweetheart is? offer up chocolate!   people have been enjoying chocolate as a food, drink and medicine for thousands of years. the ancient maya and aztecs called chocolate kakaw and used it as medicine. they also made chocolate offerings to their gods. chocolate comes from the cacao (kuh-kow) tree, and its scientific name reflects its history. theobroma cacao translates to “cacao, food of the gods.” these days, chocolate is not just for deities. the treat has become popular around the world.