Find the point (5,40) on the graph and then match up the units. It says that there are 40 million computers being sold (which means that the y-axis is the amount of computers sold) and 5 million spent on advertising (which means that the x-axis is the advertising money)
The answer is the second option. Since they're selling 40 million computers, and the number 40 is on the vertical axis, the vertical axis represents the number of computers sold and is in millions. The number of dollars spent is 5 million, and the 5 is on the horizontal axis, so the horizontal axis represents the number of dollars spent in millions.
