The line a is parallel to B, B is parallel to C, D intersects with a at point m (2). Judge the position relationship between C and D, and explain the reason

The line a is parallel to B, B is parallel to C, D intersects with a at point m (2). Judge the position relationship between C and D, and explain the reason

C and D are intersecting relations
Because a ∥ B, B ∥ C, so a ∥ C
And because D intersects a, C intersects D