Two Bulbs Are Shown in a Circuit That Surrounds a Region

Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page.When the switch is open:

A) bulb 1 is glowing; bulb 2 is dark.
B) bulb 2 is glowing; bulb 1 is dark.
C) both bulbs glow equally brightly.
D) both bulbs glow one half as brightly as they do with the switch closed.
E) both bulbs are dark.