Question id 33 - Meteorology - FAA Drone Quiz

Meteorology - In a sectional chart, two airports are enclosed by blue broken lines, as pointed out by the blue arrows in the figure. What do these blue broken lines indicate?
Class D airspace starting at the surface
Class E airspace starting at 400 feet
Class D airspace starting at 1200 feet

Training tests and timed exam simulations FAA Drone Quiz