The numerical expression shows that :

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Rational numbers are closed under addition

Rational numbers are not closed under addition

Rational numbers are closed under multiplication

Addition of rational numbers is not commutative

answer is A.

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Detailed Solution

Concept- We can identify rational numbers from other sorts of numbers thanks to their characteristics. Integers, whole numbers, and natural numbers are all examples of rational numbers. They can be expressed as a fraction p/q, as decimal numbers with endings, or as decimal numbers without endings but with repetitions. The associative, commutative, distributive, and closure qualities are some of the characteristics of rational numbers.
We have given that

Here,

are rational numbers
This implies, addition is

a rational number.
Hence, the correct answer is 1.

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