Final answer:
The union of sets A and B in each provided option includes all distinct values from both sets, combining open, closed, and infinite intervals appropriately.
Step-by-step explanation:
In the context of set theory, the union of two sets (A ∪ B) contains all distinct elements that appear in set A, set B, or both. In this scenario, we are given set A = (-0,3), which represents the open interval from just above 0 to 3. We have four different options for set B and are asked to find the union of sets A and B for each case.
This answer depends on the mathematical operation of union and the understanding of open, closed, and infinite intervals in set theory.