The statement "All integers are rational numbers" is true. To justify this, we need to understand the definitions of integers and rational numbers.
Integers are a set of numbers that include all positive and negative whole numbers, including zero. They can be represented as {..., -3, -2, -1, 0, 1, 2, 3, ...}.
Rational numbers, on the other hand, are numbers that can be expressed as the quotient or fraction of two integers, where the denominator is not zero. In other words, a rational number can be written as a fraction p/q, where p and q are integers and q is not equal to zero.
Now, let's consider any integer 'n' from the set of integers. We can represent it as the fraction n/1, where 'n' is the numerator and 1 is the denominator. Since both the numerator and denominator are integers, and the denominator is not zero, we can conclude that 'n/1' is a valid fraction and, therefore, a rational number.
Hence, every integer can be expressed as a fraction of two integers, making them rational numbers. Therefore, all integers are rational numbers.