We can already tell the slope must be negative, because as the value increases the value goes down.
We eliminate B and C to get choices of A and D.
A has a y-intercept of a positive number while D has a y-intercept of a negative number. From the points we can see that at , and at , . We can see that at the answer will be positive, so A is the correct answer.
We can check by graphing.

The red line is and we can see that seems like the best line.
You are very welcome!
:P