Answer :
The sentence that doesn't contain any errors in comma usage in Letter B because it is correct and the proper placing of comma before the conjunction is correct
Which sentence does not contain any errors in comma usage?
A. Our old sweaters look like big, fluffy animals. B. This is the worst, and least exciting museum we've ever toured. C. The brighter, thinner fabrics will be cooler in the summer. D. This easy fun and quick bicycle ride is delightful every time.