I believe the answer is the first one
C is the correct answer
Sorry if It’s wrong
Sputnik I was the world's first ever artificial satellite that launched by the Soviet Union in 1957. This marked the start of the "space age" which pushed the race between the US and the USSR in the field. Because of this "competition", many scientific discoveries were made to study and even travel to outer space.
The second one because nobody really cares who is was written for