Add a nonrestrictive
element using dashes.

The author is coming to our
school.

i think it may be b, i'm not exactly too sure on this. but b seems to make more sense.

pandas are endangered because of habitat destruction by humans.

as of 2014 there were around 2,000 left, since then, it supposedly has risen 17%.

they are a very endangered species.

-theoneandonly003

i think the answer your looking for is

enforced