Aswer B they used diagonal spiral or curved lines
This is a true statement. The dictionary definition of "synthesizer" is "an electronic musical instrument, typically operated by a keyboard, producing a wide variety of sounds by generating and combining signals of different frequencies."
Playing with lights can create different horror effects on objects. A direct light or underexposure on a face can make a variety of distortions. Using silhouette can add illusions on shadows, it defies the real size and form of the source.