The point located at the coordinates (-1, -3) is point E, which corresponds to answer choice C.
The question asks which point is located at the coordinates (-1, -3).
By examining the list of points with their corresponding coordinates, we can identify that point E is the one located at (-1, -3).
a=13.3
b=1,3
c=3,1
d=3,-1
e=-1,-3
f=-3,-1
Therefore, the correct answer is C.point E