D. Correlative conjunctions are found in pairs.
These are conjunctions such as - neither...nor, either... or, etc.
If your options are these:
<span>A) It is very difficult to fully enjoy nature by oneself.
B ) To experience nature to its fullest requires mental effort.
C) No human being can fully and truly experience nature.
D)The enjoyment of nature is something that takes practice.
It might be said that the best option is B </span>To experience nature to its fullest requires mental effort because Emerson believed that the power in nature is due to nature and to human´s intelligence. What is more, Nature could help "individuals to be more content within society".
There are many of them. Restriction, border, boundary, edge, bound, maximum, restrain.
In my opinion, the correct answer is <span>d) ethos. Jefferson refers to the right of the newly established United States in the broader context of universal rights of all free and independent states; furthermore, he underlies all the presumably just causes that an independent state may engage in, such as matters of war and peace, alliances with other states, free commerce, etc. His phrase "of right" is of utmost importance here - it underlines the ethos, providing a broader context and justifying the United States independence.</span>