Answer:
C
Explanation:
Rational numbers are those which can be expressed as a ratio of two integers. In other words, it means numbers which can be expressed as a fraction containing only whole numbers.
Whole numbers (integers), fixed-legnth decimals, and recurring decimals are all rational.
Irrational numbers are non-recurring, infinite decimals. For example, the value of π. Such numbers cannot be expressed as a ratio of two integers.
√16 = 4 and √36 = 6. All integers (whole numbers) are, by definition, rational, as they can be expressed as divisable by 1, such as 4/1 and 6/1 in the case of this question.