When an audience member translates the speaker's verbal and non-verbal messages into information and ideas, this process is known as:
a) channel confusion.
b) decoding.
c) noise.
d) encoding.

Decoding

Explanation:

Decoding is the phenomenon that explains the ability to sound out that word you don't know, is the key skill to become a good reader. This is known as decoding.  

Thus in the above context when audience members try to translate the speaker's nonverbal and the verbal message into the information and the ideas through decoding. This is the only way through which the audience can understand the meaning of the speaker's speech what a speaker wants to tell the audience.

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