My answer would be A I once knew someone with autism
The least abundant gas in out atmosphere is Carbon dioxide at 0.03%.
That x-intercept is where the line passes through the x axis (the horizontal line) and the y-intercept is where the the line passes through the y axis (the vertical line).
The slope is kind of like how slanted the line is. The slope is 2 because for every 1 point the goes horizontally, it goes 2 points vertically.
In case you have np idea what on earth I just said the answer is 2.
