Read the excerpt from the code book. a theoretical breakthrough would be a fundamentally new way of finding alice's private key. if a theory is an idea, then something theoretical is true. likely. unproven. unbelievable.

It is C. Unproven.

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C) unproven.

Explanation: the denotation of a word is its literal meaning, the definition that we can find in a dictionary, a word can have several denotations (or definitions). In the given excerpt we can see the use of the word "theoretical" and then the affirmation that a theory is an idea, based on the excerpt and on the given information, we can say that the denotation of "theoretical" is something that is unproven.

- free verse.

- " in poetry, one of the best ways to practice technique is to write in. i want all to be unstressed so that “all the clocks” and “in the night” are matching anapests. many forms that sharpen skills are useful in free verse."