Which of the following best describes frozen register?

The description of a frozen register refers to language that is fixed or unchanging, typically because it is used in formal or ceremonial contexts. This could include texts like legal documents, religious scripture, or the lyrics of a national anthem. These forms of communication do not adapt or evolve over time and are often recited or referred to in their original form.

In contrast, the other options represent forms of language that are dynamic and subject to change. A conversation among peers can vary widely based on context and relationships. Informal exchanges involve fluid language and can change based on the interaction's context. Discussions that evolve with context indicate a conversational nature that adapts and grows with new input, which is the opposite of what frozen register implies. Thus, the best choice that captures the essence of fixed, unchanging language is indeed the description of a text that remains unchanged over time.