The answer to your question is a
I believe the answer is B
The genocide happened in Rwanda, you are correct.
I think it's El Paso but I could be wrong.
1-choose any two points on the line.
2-draw a right-angled triangle with the line as hypotenuse.
3-use the scale on each axis to find the triangle's: vertical length.horizontal length.
4-work out the vertical length ÷ horizontal length.
5-the result is the gradient of the line.