Peter Is a Retired Neuroscientist Who Has Painted as a Hobby

Peter is a retired neuroscientist who has painted as a hobby his whole life. He likes to think that he has implemented his science in his art and that he scientifically produces the best paintings possible. He also firmly believes that colours can drastically influence one's mood and behaviour. Now that he has retired, he hosts wine and painting nights at his house and he invites friends over to teach them a bit about painting.
-Peter also has grapheme-colour synesthesia.This means that _________________.

A) when he sees a specific colour, he also can hear a pleasant melody
B) when he tastes something sweet and closes his eyes, he sees pretty colour
C) when he sees the number 8, he perceives it to be yellow even when it's not
D) when he paints with blue colours, he experiences sad emotions