Read the passage from "The Wise Old Man and the Ferocious Leopard.”

"Here is our enemy the leopard,” cried the old man to his family. "Help me pile stones.”

The old man and his family piled stones for him to stand on. As the leopard forced his way through the grass roof so that he could jump into the hut, the old man seized his red-hot knife from the fire. He plunged the knife into the leopard, again and again.

"Now the leopard will no longer attack us,” cried the old man. "He is dead and we can live without fear, and sleep peacefully in our huts at night.”

So the people of that village decided that the old man should be their chief because of his wisdom and his bravery.

Which detail from the passage is a fact?

The old man is wise and brave.
The grass roof is not strong.
The leopard is the people’s enemy.
The people choose the old man as chief.