We know, a rational number is a number that can be expressed as the quotient or fraction pq of two integers, a numerator p and a non-zero denominator q. Since q may be equal to 1, every integer is a rational number.
Here, (√2)2=21=2 is a rational number.
Since √2 is irrational,
2√2, 2+√2 and √22=1√2 are also irrational.
Hence, option A is correct.
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