I can’t draw very good my art is only good when i’m high
The melanin in Chloe's hair is decreasing. Melanin is a substance in our hair, skin, and eyes that determines pigment. If Chloe has more melanin in her hair, her hair will be darker; if Chloe has less melanin in her hair, her hair will be lighter.
Well A and d are obviously wrong and based on context clues I’d go with B