Which of the following is a quantitative measure of text complexity?

Conventions of language refer to the rules and norms governing language use, such as grammar, punctuation, and spelling. While adherence to these conventions can affect clarity and readability, they do not provide a quantitative measure of complexity. Instead, they focus more on correctness and style rather than specific numerical values.

Knowledge demands refer to the background knowledge required by a reader to understand the text. This qualitative factor can influence text complexity but cannot be quantified in a straightforward manner. It varies greatly among readers based on their prior experiences and education, making it an unreliable measure of text complexity.

Structure pertains to how information is organized within a text, including elements like paragraphs and headings. While certain structures can enhance or impede comprehension, they do not provide a numerical measurement. The complexity of structure is more subjective and dependent on the reader's familiarity with different formats.