Answer 1
All that means is that if you divide the numbers by two, you will be still left with a right triangle. It doesn't help you enough to state answer 1 as the right answer. This is the second best answer.
Answer 2
All answer 2 does is show that you have a triangle. It doesn't help you to prove that you have a right triangle. In order to have a triangle, any 2 sides must be greater than the third side.
Answer 3
This answer is true but purely coincidental. It won't do anything to prove that you have a right angle.
Answer 4
a^2 + b^2 = c^2
a = 6
b = 8
c = 10
6^2 + 8^2 = 10^2
36 + 64 = 100
100 = 100
The Pythagorean theorem shows you have a right triangle
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