Answer:
The answer is letter A, the importance of natural resources to man and letter D, all of nature works together for man's benefit.
Step-by-step explanation:
Ralph Waldo Emerson- He is a popular American essayist of the mid-19th century. He's primarily known for the transcendentalist movement. It is a movement that was against intellectualism and spirituality. In relation to this, Emerson made the "Nature," an essay that fueled the movement. This was divided into four parts (according to usage): Commodity, Beauty, Language and Discipline. He pointed out that people use nature in these fields and yet they don't appreciate what nature has to offer. This shows the importance of nature to man. So, letter A is one answer.
Emerson also reiterated that all of nature's parts work together for the profit/benefit of man. For example, he said that the sun evaporates the sea, the rain feeds the plant or the plant feeds the animal. All of nature work together for man. No matter how much nature gives, humans have hard time reciprocating. So, this explains letter D as another answer.
In addition, Emerson wanted humans to accept the full beauty of nature by not getting distracted of the world's material things. He also stated how important it is to stay away from worldly desires in order to be one with nature.