A microwave oven works at the frequency of 2.4 GHz. A large sheet of chocolate was placed in the working microwave (without the rotating plate). After it was removed, there was a distinct pattern of partly melted chocolate. The areas of melted chocolate were separated by area of non melted ones. What was the distance between the melted regions?
A. About 6 cm
B. About 12 cm
C. About 24 cm
D. About 48 cm