Concept:Phonetics is the branch of linguistics that deals with the physical sounds of human speech – how they are produced, transmitted, and heard.Explanation:Every language uses a limited set of speech sounds. Phonetics involves the description and classification of these sounds based on how they are produced by the vocal organs, how they travel through the air, and how our ears perceive them. It is the scientific study of all possible sounds we make while speaking. It does not study handwriting, spelling rules, or the overall structure of languages (that is grammar or syntax). Therefore, the correct meaning of phonetics is the study of speech sounds of a language.Answer:Option A – The study of speech sounds of a language.