【单选题】Which of the following does NOT violate the principles for being an ethical speaker?
A.
The speaker hopes to advocate the audience to take actions against the environmental pollution at all costs.
B.
The speaker tries to convince the audience that gay marriages are no different from the traditional ones, even though s/he doesn’t think so him/herself.
C.
The speaker quotes out of context a scholar’s article to prove his/her own viewpoints.
D.
The speaker has made full preparation for the speaking in order to make it a worthy learning and sharing experience.