Editor
If midpoints of the sides of a triangle are (1,-1), (-4,-3) and (-1,1), then coordinates of the vertices of the triangle are:
Difficulty: Easy
A: 
(-6,-1),(-4,2), (-2,3)
B: 
(-2,-5), (-6,-1), (4,3)
C: 
(-6,-1), (-4, -3), (5,2)
D: 
(-1,0), (-6,-1), (4,3)