The word "shed" in the 3rd paragraph means closest to "______".

A. To find out exactly what happens.
B. To save fuel to fly longer.
C. To find out where the big stone is.
D. To fly even more slowly.

A. The plane flies at high altitudes.
B. The plane is filled with air.
C. The metal structure of the plane is very strong.
D. A small part of the plane cracks.