For a right triangle, according to Pythagorus theorem,

Here, c is the hypotenuse, a, b- length of other two sides.
The longer side is called the hypotenuse of a right triangle.
Conside option 1
1.6, 6.3, 6.5
6.5 is the longest side.

Since side lengths 1.6, 6.3, 6.5 obeys Pythagorus theorem, the sides is of a right triangle.
The other given ste of sides does not follow Pythagorus theorem.
Consider 1.1, 6.3 , 6.5

Consider 4, 5, 6.

Consider 1.7, 14.4. 43.3.

Hence, 1.6, 6.3, 6.5 is correct.