This is a difficult one to answer but I think that your answer might be B: The orange and blue flower uses complementary colors.
Explanation:
I think this is because the rest of the painting mostly has duller colors like the green, black, and browns. So, this was added in to give the painting a few bright colors to stand out but, to also not take away from the full picture.
I like Malcolm in the middle but Balthazar ain’t playin Fr Fr. Willy wonka was my uncle but he made my baby boy outta chocolate so every time he goes outside, he just goes✌️