The correct answer is B) current paths in the power circuit are drawn as heavy lines and in control circuit as lighter lines. This is because in electrical motor controller elementary diagrams, the power circuit, which carries the high-current load, is typically represented with heavier lines to distinguish it from the control circuit, which carries lower-current signals. The power circuit is the main path for the flow of electricity, while the control circuit is responsible for controlling the operation of the motor. Using heavier lines for the power circuit makes it easier to visually identify the primary current paths in the diagram. The other options are incorrect because they do not accurately reflect the standard convention for drawing these types of diagrams. Circuits above 500 volts are not necessarily drawn with lighter lines, and the control circuit is not typically drawn with heavier lines than the power circuit.