Answer:
A line plot consists on a line with N separated marks, where each position may represent an event. And over those positions, you put crosses that represent each time that the given event happened.
For example, here we have:
Red 5
Blue 4
White 6
Green 5
So we can make a line plot that in the bottom (in the horizontal line) we have 4 marks, one for each color.
on top of the red mark, we have 5 crosses,
on top of the blue mark, we have 4 crosses
on top of the white mark we have 6 crosses
on top of the green mark we have 5 crosses.
And it is useful to put it in order, so the color with fewer marks goes first and so on.
Then the order of the colors in the line plot is:
Blue, red, green, white.
