Which of the following statements is true about the number 30/2?
A. It is contained in the set of natural numbers, whole numbers, integers, and rational numbers, but it is not contained in the set of irrational numbers.
B. It is contained in the set of irrational numbers and rational numbers, but it is not contained in the set of natural numbers or whole numbers.
C. It is contained in the set of rational numbers, but it is not contained in the set of natural numbers, whole numbers, integers, or irrational numbers.
D. It is contained in the set of whole numbers and rational numbers, but it is not contained in the set of irrational numbers or integers.