SAT English Practice Question

The author of this article, a historian of American literature, is writing a critical essay on the poet Walt Whitman. The author wishes to emphasize the importance of Whitman's work by noting that it is still read and studied today. Which choice best completes the text so that it conforms to the conventions of Standard English?

1. A.After all, more than a century and a half after its publication, Whitman's poetry continues to resonate with readers.
2. B.Whitman's poetry continues to resonate with readers, more than a century and a half after its publication.
3. C.More than a century and a half after its publication, Whitman's poetry continues to resonate with readers.
4. D.Whitman's poetry continues to resonate with readers, after all, more than a century and a half after its publication.