Question

Someone please help me

Answer 1

Each mountain wood plain and river knows those things that I (easily?) hide from (other) men.

So the answer is A

He is not concealing anything from himself -- at least not in these 2 lines. He is concealing things from other people. B is incorrect.

He may be at home in nature. We don't know, not from these lines. C is incorrect.

It is not his preference to choose either other people or nature to be comfortable with. We have no idea which he might choose. D is not an option.

Answer 2

I would say the first option. "river knows. I from man conceal". To me says nature knows but he's hiding it from people.