The correct option is D. During the last six months of the war, the United States of America, release atomic bombs on two different cities of Japan within a short space of interval. This move was not expected at all by the Japanese and it served as the final stroke that breaks the elephant's back. It leads to quick surrender by the Japanese.
The correct answer to this open question is the following.
The two sentences in which you identify the main idea would be these.
Mother nature is so smart that she knows how to constantly rebuilt and regenerate itself. To the human eyes, a fire hurts so much. We think that fires destroy nature. But as in the case of fires or heavy rains, the purpose is to clean what must be cleaned.
Maybe this comparison would help. It is like us, the humans. We often need to clean ourselves by having showers. Once in a while, a flue, a minor stomach pain helps us to remove energies that don't serve us.
It is exactly the same as mother nature. Once in a while, she needs fires, hurricanes, strong winds, heavy rains, or earthquakes to remove bad energy.
The supporting detail of this paragraph would be<em> "Fire also may kill predatory insects or pests that live on and damage otherwise healthy trees."</em>
I believe it would be land and Gold.
During the earliest era of settlement, the colony promised settlers some amount of free lands if they're willing to move into a certain area.
Gold at that time was pretty easy to find on those land, so many of the settlers were really interested to came.