Which sentence should replace sentence 5 to create a more effective and clearer position statement?

The 383 gray wolves are a part of Yellowstone National Park
and therefore a part of the world.

For that reason alone, the gray wolves in Wyoming-their
numbers have now swelled to 383-should be protected
against being hunted to extinction again.

Therefore, the 383 gray wolves now living in and around
Yellowstone should be left alone to spread south to Colorado
and west to Idaho and north into Montana.

Many reasons support letting the 383 gray wolves stay in and
around the Yellowstone area, and I will discuss some of them.