Answer :
Part A: The correct answer is D.
In this excerpt, the author uses logic to explain that, even though white men show themselves as moral and trustworthy people, they are actually dishonest and do not have the indian's best interest at heart.
Part B: The correct answer is D.
The phrase "carry false looks, and deal in false actions" supports the depiction of white men expressed in the paragraph above because it suggest that, just as their looks are deceitful, so are their intentions.
This phrase suggest that everything harmful thing that white men do under the excuse of trying to help the indians, is done on purpose.