The large, flat piece of wood within a piano serves the same purpose as (a) a bamboo reed (b) a set of wooden drum sticks (c) a guitar pick (d) the hollow box within a violin

The answer to the question presented above would be d) the hollow box within a violin. The large, flat piece of wood within a piano serves as the same purpose as the hollow box within a violin because it serves to retain the sound vibrations within the piano.