Answer:
They are both two Black Islam converts who have gone through the same struggles and are using their religion as a way to inspire others for which they believe in.
Among the things you've provided - the option that doesn't resemble and also isn't a response to an internal stimuli would be wearing sunglasses to protect eyes from UV rays. In all the other cases, the person who does a certain action also gets a feedback from his body which urges him to do that certian action. This isn't the case in D where he sees the sun and knows about the bad UV rays and decides for that course of action.
It is a carefully engineered area that used to deposit waste products.