<span>The sentence that does not contain any errors in comma usage is A. Sam ate his breakfast, three pancakes, rather slowly. In B, there should be a comma before the store owner, and after if, because that is an appositive phrase describing the subject. In C, the goalie should be separated from the rest of the sentence by two commas. In D, there should be a comma before a children's lullaby. </span>
<span>B.". . . when well trained, no children are more courteous and agreeable," because there is no connection between good education and good behavior.</span>
