The two unlike elements being compared in the simile from the excerpt of The Odyssey -"but Cyclops went on filling up his belly with manflesh and great gulps of whey, then lay down like a mast among his sheep"-are the Cyclops and the mast of a ship. The comparison is made by likening the Cyclops lying down to a mast standing upright on a ship, emphasizing the Cyclops's large, upright form among the sheep
. Thus, the correct answer is:
the Cyclops and the mast of a ship.