The free bird is portrayed as a bold bird, that know that the sky is his to take, and the world is his to discover, to experience, the best description of the free bird on Maya Angelous´s poem is dares to claim the sky, as he is brave enough to do so.
A is talking about a sharp tool B is talking about nails and claws C is talking about an X-ACTO knife D is talking about him actually writing something.