Because consideres pluto as a icy body rather than a planet
D) is definitely an academic skills.
A) - I would say as well, especially academic writing.
About B and C- I would say it depends - reading what? novels? organizing what? your paper? out of the two I would say that C) organizing is the better choice but it is also useful in science.
Based on his transcendental beliefs and civil disobedience it is most reasonable to assume that thoreau
thought following his conscience was more important and better than following the law.