In the electric circuit below, light bulbs are placed at A, B, and C. When the switch is closed, all three light bulbs are lit. 
What happens to Bulbs A and C if Bulb B burns out?
Both Bulbs A and C will go out. 
Bulb A will go out, but Bulb C will stay lit. 
Bulb C will go out, but Bulb A will stay lit. 
Both Bulbs A and C will stay lit