If a single change of a single bit in the plaintext causes changes in all the bits of the resulting ciphertext, what is this called?

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Basic information theory is the basis for modern symmetric ciphers. Understanding the terminology of information theory is, therefore, important.

If a single change of a single bit in the plaintext causes changes in all the bits of the resulting ciphertext, what is this called?
A . Complete diffusion
B. Complete scrambling
C. Complete confusion
D. Complete avalanche

Answer: D