Final answer:
When multiplied by 0.5, the number 1 produces a rational number.
Step-by-step explanation:
A rational number is a number that can be written as a fraction, where the numerator and the denominator are both integers. To find a number that produces a rational number when multiplied by 0.5, we need to find a number that, when multiplied by 0.5, results in a fraction.
For example, 1 is a number that produces a rational number when multiplied by 0.5. When we multiply 1 by 0.5, we get 0.5, which can be written as the fraction 1/2.
In this case, the correct answer is 1.
Learn more about Rational numbers multiplication