Final answer:
The answer is C. all elements in both A and B.
Step-by-step explanation:
The correct answer is C. all elements in both A and B.
A ∩ B represents the intersection of sets A and B. It includes all elements that are present in both A and B. In other words, it represents the common elements between the two sets.
For example, if A = {1, 2, 3} and B = {3, 4, 5}, then A ∩ B = {3} as 3 is the only element that is present in both A and B.