I’m pretty sure it would be B but it could also be D
Answer by JKismyhusbandbae: heroin
Why: Heroin and morphine are related. They are both derived from opium. And known as painkillers.
Your brain has nerves and those nerves run throughout your system so in that case your central nervous system control everything. It is like a director it tells your heart to pump blood it signals everything it even control your homeostasis and reflex.
