Evaluate: $$\left(\frac{\tan 20^\circ}{\cosec 70^\circ}\right)^2 + \left(\frac{\cot 20^\circ}{\sec 70^\circ}\right)^2 + (2 \tan 15^\circ \tan 75^\circ)$$

A

3

B

$$\frac{1}{2}$$

C

$$\frac{\sqrt3}{2}$$

D

1