Which aspect of language concerns how words are arranged to create sentences?

The correct answer is syntax, which is the aspect of language that deals specifically with the rules and principles governing the structure of sentences. Syntax involves the arrangement of words into a coherent and grammatically correct format that conveys meaning. Understanding syntax is crucial for sentence formation, as it dictates how different parts of speech (such as nouns, verbs, and adjectives) should be positioned relative to one another to form understandable statements or questions.

The other aspects of language are related but focus on different elements. Semantics pertains to the meaning of words and phrases within a language, examining how meanings are derived and understood. Pragmatics involves the context in which language is used, including the social aspects of communication like implied meanings and the effects of context on interpretation. Phonology focuses on the sounds of speech and how they are organized and used in a particular language. Thus, while all these areas are important in the study of linguistics, syntax is the specific domain that deals with sentence structure and word arrangement.