Answer:
Beecher delivers a speech that advances the perception of Abolitionists as heroes.
Explanation:
Option A is the correct sentence that can be included in between sentences 1 and 2. This is true because since Beecher contemplates of an approach he should take in appealing to his English audience, he will definitely do that as a means of advancing his audience's perception of abolitionists as heroes.
Also, sentence 2 makes it clear that he is praised while leaving. Heroes are actually praised. Therefore, having advanced their perception of abolitionists as heroes, he was praised as an hero because he is an abolitionist.