challenge: What was Capaneus doing when Zeus struck and killed him with a thunderbolt?
  
  A. Fighting off a group of Theban warriors in hand-to-hand combat
  B. Climbing down a ladder, retreating from the siege
  C. Standing at the gates of Thebes, shouting insults at the defenders
  D. Mounting a ladder, attempting to breach the walls of Thebes
  Answer: 