If is:

Correct option is A

Given:

$$A = \frac{58^2 - 25^2}{46^2 - 37^2}, \quad B = \frac{26^2 - 15^2}{56^2 - 15^2}$$​​

Formula Used:

$$a^2 - b^2 = (a + b)(a - b)$$​​

Solution:

$$A = \frac{58^2 - 25^2}{46^2 - 37^2} \\A = \frac{83 \times 33}{83 \times 9} = \frac{11}{3} \\B = \frac{26^2 - 15^2}{56^2 - 15^2} \\B = \frac{41 \times 11}{71 \times 41} = \frac{11}{71} \\\frac{1}{B} - \frac{20}{A}\\ \ \\= \frac{71}{11} - \frac{60}{11} \\ \ \\= \frac{11}{11} = 1$$​​