Is abc with vertices a (-2 - 5) b (2, 0) and c (-1, - 4) a right triangle?

ABC is a right triangle because AB | BC

ABC is a right triangle because BC | AC

ABC is a right triangle because AB | AC

ABC is not a right triangle

ABC is not a right triangle.

If you'd graph these numbers, they wouldn't be a right triangle.

How do I know?: a (-2, - 5) and c (-1, - 4) are both in quadrant 3, (Bottom left.)

Also, - 4 and - 5 are awfully close to each other making it impossible to be a right triangle.