Mrs. Dubose is referring to Atticus' defense of Tom Robinson. Her declaration that he was going against his raising directly relates to Simon Finch, and the fact he was a slaveowner. The fact that Atticus followed his own heart, values, and sense of morality was a good thing.
A parallel sentence mentions the same grammatical expression twice. I would go with "D". 'Passed' and 'Demonstrated' are both past tense words that express the same past tense grammatical idea.
