What is present in a world of change that tells you it is an expository text

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If an atom has no charge, what can we say about the subatomic particles in the atom? a) there will be the same number of protons and neutrons, but a different number of electrons. b) there will be the same number of electrons and neutrons, but a different number of protons. c) there will be the same number of protons and electrons.

read this excerpt from president john f. kennedy’s inaugural address on january 20, 1961: in the long history of the world, only a few generations have been granted the role of defending freedom in its hour of maximum danger. i do not shrink from this responsibility—i welcome it. i do not believe that any of us would exchange places with any other people or any other generation. the energy, the faith, the devotion which we bring to this endeavor will light our country and all who serve it—and the glow from that fire can truly light the world. and so, my fellow americans: ask not what your country can do for you—ask what you can do for your country. my fellow citizens of the world: ask not what america will do for you, but what together we can do for the freedom of man. based on the excerpt, what is the central idea of this speech? a. to cultivate a sense of well-being among the american people b. to motivate people everywhere to uphold the freedom of humankind c. to motivate americans to strive for the development of their nation d. to foster a feeling of happiness and unity across people and nations