Rational numbers cannot...

The correct answer is: Go on forever without repeating

TO FIND-
Nature of rational numbers.
SOLUTION-
Rational numbers refer to those numbers that can be represented as a simple fraction and can be either a whole number, a terminating decimal or a non terminating recurring decimal.
From the above explanations, we can conclude that numbers that go on forever without repeating are called non-terminating, non-recurring numbers, which are irrational numbers.
Hence, rational numbers cannot go on forever without repeating.
FINAL ANSWER-
Option 'a' i.e. 'Go on forever without repeating' is the correct answer to the given question.