Questions: "Communication code symbols" include words, phrases, and sentences that are used to evoke images, thoughts, and ideas.

The answer is sentences.

Books are collections of written or printed works, but they are not typically considered "communication code symbols" themselves. They contain symbols, such as words and sentences, but are not symbols in and of themselves.

Morals refer to principles or rules of right conduct or the distinction between right and wrong. While they can be communicated through symbols, they are not symbols themselves.

Sentences are structured groups of words that convey complete thoughts. They are indeed used as communication code symbols to evoke images, thoughts, and ideas, making this the correct choice.

Ideas are concepts or mental representations, not symbols. They are what symbols aim to convey or evoke, but they are not symbols themselves.