Which sentence does not contain any errors in comma usage? A. Mrs. Beecher, whose maiden name is Parker, just painted her house blue. B. Mrs. Calhoun whom we met a year ago can ride horses. C. My favorite poet, whose poems are about everyday life has published a new book. D. Darren whom I miss dearly, will return from his trip next week.

The sentence with the correct comma usage is A "Mrs. Beecher, whose maiden name is Parker, just painter her house blue." It is the only one that correctly places the aside (the fact that her maiden name is Parker) completely within commas. When you are adding a modifying statement in the middle of a sentence (using words like whose, which, and whom) you must be sure to place a comma at the start and end of the modifying phrase.