Answer:
B ethics
Step-by-step explanation:
The speech is making an appeal to ethics, and how many brave men died for a purpose, and it is our duty or duty of the audience to not let that death and suffering be in vain, the speaker wants to fully convince the audience that the sacrifice that the brave soldiers did defeating the confederacy in the same city where they now pay a tribute, and Lincoln calls the public to continue the efforts of changing and moving forward in the reconstruction of the country.