Because solid state diodes have no filament,, they square B. are less efficient than tubes C. require less operating power D. require more operating power

C. require less operating power<br /><br />Solid-state diodes do not have a filament, unlike vacuum tube diodes. This means that they do not require as much operating power to function. Solid-state diodes are more energy-efficient and have a longer lifespan compared to tube diodes.