Stefan is writing the conclusion of his essay about solar eclipses. Which detail would be the best fit for the ending? 1. A solar eclipse happens out in space within our solar system and is visible from all locations on Earth.
2. A full solar eclipse only occurs once every hundred years. Partial eclipses happen more often, several times a year.
3. A solar eclipse is when the moon lines up perfectly between the Earth and the Sun, blocking the Sun from the Earth for several minutes.
4. A solar eclipse is an exciting rare occurrence that people look forward to. It is quite a phenomenon for the Sun to be blacked out.

D. A solar eclipse is an exciting rare occurrence that people look forward to. It is quite a phenomenon for the Sun to be blacked out.

Explanation:

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citizens are given 25 years of life to prove their worth to society; if they fail to do great things

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.