Concept:Phonemes are the smallest distinct units of sound in a language that can change the meaning of a word.Explanation:Phonemes are not letters or grammar rules. They are sounds. Each language has its own set of phonemes. For example, changing /th/ in "thin" to /ch/ gives a different word "chin". This shows phonemes distinguish meaning. Phonemes are written between slashes, like /p/ or /b/. They are the basic sound building blocks of speech. Vowels and consonants both include phonemes, but phonemes are not only vowels or the alphabet. Grammar deals with sentence structure, not sound units.Answer:Option A: sounds of a language