Question

Which of the following is not true?

• A. rational numbers are closed under addition.
• B. rational numbers are closed under subtraction.
• C. rational numbers are closed under multiplication.
• D. rational numbers are closed under division.

Answer 1

The correct option is D

rational numbers are closed under division.

Explanation.

According to the properties of rational numbers:

Rational numbers are closed under addition, subtraction, and multiplication.

Thus, the rational numbers are not closed under division.

Hence, the correct option is $\mathrm{D}$.