The answer is "B". These spirals were symbols for things like the sun or water.
Nana.
Higashi no Eden (Eden of the East)
Plastic Memories.
Clannad: After Story.
Tokyo Magnitude 8.0.
Shigatsu wa Kimi no Uso (Your Lie in April)
Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai. ( AnoHana: The Flower We Saw That Day)
Kokoro Connect.
If you add more gray to a color, it make the color a darker shade of whatever the color is, if you were to add white it'd be a lighter shade of color
Element of what?? Principle of what ???