How do paragraphs 9-10 contribute to the development of ideas in the text?
A.
They emphasize how hard it was to decode a secret message.
B.
They show that decoding work was largely based on luck and chance.
C.
They prove that decoding messages was mostly done by a computer.
D.
They show how different countries had different coding styles.
B.
They show that decoding work was largely based on luck and chance.