The error in the given sentence above is the wrong verb form being used. The subject is "The explosion of clown crews" and this is a singular subject because it refers to the word "Explosion". Therefore, the verb should also be singular which is "allows". Here is the correct sentence: <span>The explosion of clown crews allows unique styles of dance to evolve, such as krumping.</span>
B. did all their chores and then they decided to watch a movie
<span>It uses a respectful tone and offers researched evidence to effectively refute the counterclaim.</span>
