The number that is irrational is the operation A - B. Option D
What is an irrational number?
A real number that is irrational is one that cannot be represented as a fraction of two integers and whose decimal representation never ends.
Put differently, irrational numbers cannot be expressed as the ratio of two integers, where the only common factor between the numerator and denominator is 1. An irrational number has a non-terminating, non-repeating decimal expansion.
We have that;
√12 - √3
√4 * √3 - √3
2√3 - √3
= √3