What was the first video game to make a profit?
a
pong
b
pac man
c
tetris
d
space invaders

The correct answer is D. It was "Space Invaders" the first video game to make profit. It was launched in 1978 by Taito. It launching was the beginnings of the reign of video games. Many arcades in shopping malls and in corners were built and even in restaurants, grocery, theaters and bars. 

Very useful. it is to learn because history repeats itself so learning about it those mistakes not happen again.