Simplify the expression.

Correct option is D

Formula Used:

​$$a^2-b^2 = (a-b)(a+b)$$​​

Solution:

$$\frac{3.35^2-1.25^2}{3.35+1.25}\\\ \\\frac{(3.35+1.25)(3.35-1.25)}{(3.35+1.25)}\\3.35-1.25 = 2.1$$​