In the following figure, if l $$\parallel$$ m, then find the measures of angles marked by a and b.

A

$$a = 90^{\circ}$$ and $$b = 90^{\circ}$$

B

$$a = 55^{\circ}$$ and $$b = 125^{\circ}$$

C

$$a = 70^{\circ}$$ and $$b = 110^{\circ}$$

D

$$a = 60^{\circ}$$ and $$b = 120^{\circ}$$