A. Go to the game settings menu and look for audio options. There should be a section for sound effects and voice acting. If there is no option to turn off voice acting, try lowering the volume for voice acting specifically, if available, or muting the overall sound while keeping the game sounds on.
B. If the game does not allow you to turn off voice acting, consider using headphones with a built-in microphone that allows you to mute the audio without affecting the game itself.