The Lion and the BullA Lion prowled about in a pasture where four bulls were grazing. He tried many times to capture them, but each time he failed. Whenever he came near, the four bulls turned and formed a ring, so that no matter which way the lion approached, he was met by their horns.One day, however, the bulls had a quarrel and would not speak to one another. Each went alone to a separate part of the pasture to graze. This was the moment the lion had been waiting for. One by one he attacked the bulls and made an end of them.Well-fed and contented, the lion thought, "Those beasts would still be grazing had they remembered:"United we stand; divided we fall."One day, all the bulls went in different directions because ______.

• A. they wanted to see new pastures
• B. they wanted to search green grass
• C. they had a quarrel
• D. all of the above