The Switch S Is Initially at Position a for a Long

The switch S is initially at position a for a long time. It is then switched to position b. Describe what happens to the lightbulb as a function of time when the switch is flipped from a to b?

A) The lightbulb was on but goes off immediately.
B) The lightbulb was off and stays off.
C) The lightbulb was on but its brightness decreases with time and eventually goes off.
D) The lightbulb was on and stays on.
E) The lightbulb was off. It then lights up but the brightness decreases with time and eventually goes off.