Answer:D. [tex]A\subset \mathbb{R}\times\mathbb{R}.[/tex]Step-by-step explanation:Consider the set [tex]A=\left\{(2,3),\ (5,1),\ (-3,-2),\ (0,3)\right\}[/tex]This set consists of four ordered pairs. The first numbers in these pairs are [tex]2,\ 5,\ -3,\ 0.[/tex] These numbers are integer numbers (not natural, because -3 is negative).The second numbers in these pairs are [tex]3,\ 1,\ -2,\ 3.[/tex] These numbers are integer numbers too (not natural, because -2 is negative).Options contain only natural and real sets, so, the first and the second numbers are real numbers and[tex]A\subset \mathbb{R}\times\mathbb{R}.[/tex]