The story a sound of thunder. what is it mainly about?

i know im 3 years  late but for anyone else here ya go

“The Sound of Thunder” fits into a science fiction genre, due to the fact that the characters go back into time; with the events that follow the whole world is changed when one little tiny thing is affected. Many of the things that happen in the story can be applied into real life, many of which you would not think about. The theme of the story is very realistic but futuristic at the same time; therefore, making it very complicated with real problems in the modern world but not having it appear that way. The story has a domino  effect when Eckles stepped on the butterfly it had changed everything in the world when they had returned. The exact quotes are “Not a little thing like that! Not a butterfly!” cried Eckels. “It fell to the floor, an exquisite thing, a small thing that could upset balances and knock down a line of small dominoes and then big dominoes and then gigantic dominoes, all down the years across Time.” The story has to be shown as a vital lesson into modern life.

yeah! it's really me with my homework, you should try it!

the correct answer is option d. the nature of democracy. on november 19, 1863, president abraham lincoln delivered his famous gettysburg address in gettysburg, pennsylvania. in his speech, rather than focusing on details of the war (soldiers, casualties, aftermath of battle), lincoln invoked the very nature of democracy, that power ultimately comes from the people, when stating, “government of the people, by the people, for the people shall not perish”. these words mean that democracy is a government by the people (citizens) in which the supreme power is vested in the people and exercised directly by the people or by their elected representatives for the benefit of all citizens. the survival of democracy in the united states is one of the reasons why this speech so significant today.