The step of adding it to 0.25 (or 25/100, or 1/4) is indeed not relevant. 0.25 is rational.
A rational number added to a rational number gives a rational number. A rational added to an irrational number doesn't.
so effectively the task can be reduced to "wich one of these is a rational number?"
And that's only true for A. 2/9
All others can't be represented as a discrete/finite fraction / ratio.
