Actually, the correct answer is C) By changing the position of the mouth on the blow hole. When playing certain wind instruments, such as a flute or a clarinet, producing different notes involves altering the airflow by changing the position of the mouth on the instrument's blow hole. By varying the size and shape of the oral cavity, the player can create different pitches. Pressing the keys (option D) applies to instruments like a piano or a saxophone, but not to all wind instruments.
