The sides of length of the triangle are .

Theorem: In a triangle, the sum of any two sides of length is more than the remaining side of the length.

The length of the third side options are .

Check the options as follows:

Take   (This is false according to theorem)

Take                 (This is true according to theorem)

Take    (This is true according to theorem)

Take          (This is true according to theorem)

The option A is correct answer.