It was either the third statement or the last one that I would have chosen. I believe "we laughed at the dog with the shaggy fur who was catching the ball" would be the best, however.
C because all the others need a apostrophe at the end
They worked last week on Monday? That’s what I’d say.
<h3><em>1</em><em>]</em><em> </em><em>c</em><em>)</em><em> </em><em>represent</em></h3><h3><em>2</em><em>]</em><em> </em><em>c</em><em>)</em><em> </em><em>celebrate</em></h3><h3><em>3</em><em>]</em><em> </em><em>a</em><em>)</em><em> </em><em>appear</em></h3><h3><em>4</em><em>]</em><em> </em><em>a</em><em>)</em><em> </em><em>festival</em><em> </em></h3>