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${m}^{2}$

1520${m}^{2}$

2420${m}^{2}$

2480${m}^{2}$

2520D. 2520 ${m}^{2}$

We have (l-b)=23 and 2(l+b)=206 or (l+b)=103

Solving the two equatoins, we get l=63 and b=40

$\therefore \left(l\times \times b\right)=\left(63\times 40\right){m}^{2}=2520{m}^{2}$