<em>The right answer is letter C: When you have finished, clean up your area</em>. This sentence starting with "when" as a relative pronoun supposes a dependent clause will be separated from an independent one by a comma "clean up your area".
Option A follows a standard structure where the dependent clause follows the independent one; option B shows <em>"cleaning up"</em> as a detail for "finishing" as the subject of the sentence; and option D uses "cleaned" as an adjective after a modal verb "should".
Animals only understand the fear of pain and the fear of death is what Rainsford's attitude about animals at the begging of "The Most Dangerous Game <span />
