The papers and placards say, that I am to deliver a 4th [of] July oration. This certainly sounds large, and out of the
common way, for it is true that I have often had the
privilege to speak in this beautiful Hall, and to address
many who now honor me with their presence

How does Douglass establish ethos in this passage?

A. Douglass points out how little he knows about his audience and
the meaning of Independence Day
B. Douglass condescends to his audience about having to speak to
them on a holiday
C. Douglass shows his humility at speaking to the audience on this
occasion
D. Douglass expresses his social position in relation to his audience