Answer:
D
Explanation:
Rational numbers are numbers which can be expressed as a ratio of two integers (i.e. a fraction containing only whole numbers). Numbers which can't, such as the value of π, are irrational.
18.46 can be expressed as 923/50 (it does not matter that the fraction is top-heavy).
-5 can be expressed as -5/1 (-5 is already a whole number and anything divided by 1 is itself).
4/11 is already whole number fraction.
D looks like a neverending decimal which isn't recurring. Assuming this is the case, it is not possible to express it as a ratio of two integers. However neverending decimals really should be indicated by putting "..." at the end.