Final answer:
In the given options, the correct answer that contains all of the irrational numbers is A. (-1.5, 1/3, √2, π).
Step-by-step explanation:
The set of irrational numbers consists of numbers that cannot be expressed as a fraction or a repeating decimal. In the given options, the only numbers that are irrational are √5, √2, and π (pi).
Option A (-1.5, 1/3, √2, π) contains all three of these irrational numbers, so it is the correct answer.