Which concept refers to the grammatical arrangement of words in sentences?

The concept that refers to the grammatical arrangement of words in sentences is syntax. Syntax is a fundamental aspect of linguistics that deals with how words combine to form phrases and sentences, ensuring that the resulting structures adhere to the rules of a given language. Understanding syntax is crucial for grasping how different sentences can convey varying meanings based on the arrangement of their components.

In contrast, semantics refers to the meaning of words and phrases, focusing on the interpretation of the content rather than its structure. Morphemes are the smallest units of meaning in a language, such as prefixes or root words, and they contribute to the meaning but do not specifically address the arrangement of those words in sentences. Phonemes, on the other hand, are the smallest units of sound in a language that can distinguish words but do not relate to the grammatical structure of sentences. Thus, syntax is the correct answer as it specifically encompasses the rules and principles that govern how words are put together.