The x values represent the number of games sold.

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The y values represent the cost of these games.

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We see that at 0 games we have a cost of 100$ (WEIRD)

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At 1 game we have a cost of 125$

2 games 150$

3 games 175$

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With the same rate of change continuing to 10 games at cost 350$

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That total cost is the 100$ initial cost investment, plus 25$ per game produced.

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Now that I read, I see we are just buying a system and games, not actually making them. 

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That is why 0 games is 100$, because that is the ridiculously cheap deal they have going on with their system. What's the catch?

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Even their games are only 25$

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1980s

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HOWEVER

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The graph does not state anything about the system. But the description text says, "total cost of system and x games."

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I will mark A and B