What is the correct terminology for this cadence in the key of Bb major?

We understand ragtime music better than earlier forms of African American music because

a. it was preserved in written notation and recorded on piano rolls b. it was described vividly by the scholars who transcribed it c. it is a simpler style of music than the styles that preceded it d. it never featured any improvisation

Name one of William S. Yellow Robe Jr.’s key works and explain the issues he confronts in his plays

What will be an ideal response?