I would say the first option. "river knows. I from man conceal". To me says nature knows but he's hiding it from people.
I am pretty sure that the correct answer on the question which is being asked is the first option from the scale. It helps you figure out what you already know and what you need to research about your topic. The word 'idea' in question helps you to understand that you don't need to take <span>extensive list of approaches or organizer of ideas as a basis.</span>
C is the answer. Because deleterious is the opposite of helpful. And ominous is the opposite of friendly.
