Option A:
is the third vertex
Option B:
is the third vertex.
Explanation:
The two vertices of the right triangle are
and 
The third vertex of the right triangle can be determined by plotting the points in the graph.
Option A: 
By plotting the points
,
and the third vertex
in the graph, the the hypotenuse of the triangle passes through the vertices
and 
The legs of the triangle passes through the vertices
,
and
, 
Hence, the third vertex
forms a right triangle.
Therefore, Option A is the correct answer.
Option B: 
By plotting the points
,
and the third vertex
in the graph, the hypotenuse of the triangle passes through the vertices
and 
The legs of the triangle passes through the vertices
,
and
, 
Hence, the third vertex
forms a right triangle.
Therefore, Option B is the correct answer.
Option C: 
By plotting the points
,
and the third vertex
in the graph, we can see that the three vertices does not make a right angled triangle.
Hence, the third vertex
does not form a right triangle.
Therefore, Option C is not the correct answer.
Option D: 
By plotting the points
,
and the third vertex
in the graph, we can see that the three vertices does not make a right angled triangle.
Hence, the third vertex
does not form a right triangle.
Therefore, Option D is not the correct answer.