Concept: Morphology is the branch of linguistics that studies the internal structure of words and how they are formed from smaller meaningful units called morphemes.
Explanation: Words are built from morphemes, the smallest grammatical units.
Morphology examines how these units combine to create words.
For example, in "teachers": "teach" is a free morpheme (can stand alone), and "-er" and "-s" are bound morphemes (must attach to another morpheme).
Prefixes, suffixes, roots, and word origins are all part of morphological study.
This is different from syntax (sentence formation), parts of speech patterns, or semantics (meaning deduction).
Morphology focuses strictly on the structure and formation of words themselves.
Answer: A. structure of words