I would say D the Billingsella Corrugata, it IS in the oldest recorded time line, so by theory, it's the oldest (Don't quote me on that, I'm not %100)
Isn’t it in the United Kingdom I’m pretty sure let me know if I’m right please
C because that is where the main concentration of earthquakes are
The best answer is choice C. why? Because the rivers flow from the dry side of Texas to the very wet and damp side of Texas. hope this helped, have an amazing day :)