Which Is the Best Standard-Form Representation of the Following Argument

Which is the best standard-form representation of the following Argument from Principle?
Look inside the mouth of a human being. You'll find canine teeth and incisors. These teeth are adapted for eating flesh, not vegetables. It isn't just our teeth-the general biological evidence is overwhelming: the human body is by nature able to eat meat. Look to the earliest cave paintings: they show humans hunting animals. It isn't just the cave paintings-the general archaeological evidence is also overwhelming: from our earliest days on Earth, human beings have eaten meat.
In short, the scientific evidence from multiple disciplines proves that eating meat is natural for human beings. And surely behaviors that are natural for human beings are morally permissible for human beings--it would be absurd to claim otherwise.
Therefore, eating meat is morally permissible for human beings.

A) 1) Eating meat is morally permissible for human beings.
2) The biological evidence is overwhelming: the human body is by nature able to eat meat.
So, eating meat is natural for human beings.
B) 1) From our earliest days on Earth, human beings have eaten meat.
2) Eating meat is natural for humans.
So, eating meat is morally permissible for human beings.
C) 1) Behaviors that are natural for human beings are morally permissible for human beings.
2) It's absurd to claim that natural behaviors are not morally permissible. So, eating meat is morally permissible for human beings.
D) 1) Behaviors that are natural for humans beings are morally permissible for human beings.
2) Eating meat is natural for human beings.
So, eating meat is morally permissible for human beings.