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arbitrary
The author never suggests the strategy was random or involved an unreasonable process.
inflexible
The author never suggests the strategy wasn’t adaptable.
unprecedented
Supported, because the strategy was an “
necessary
The author never suggests that the test case strategy was necessary in order for Marshall to achieve his success. Although it did contribute to his success, that doesn’t imply it was required. Also, if you’re looking at the word “essential” in P2, that word isn’t used to describe the test case strategy. It’s used to describe a component of the test case strategy — that component is necessary to the test case strategy, but we don’t know whether the strategy itself is necessary for something else.
subjective
The author never suggests that the test case strategy was based on personal tastes or feelings or other kinds of subjective criteria. We have no evidence from the passage that Marshall’s criteria for selecting cases were subjective. And no, the mere fact that Marshall evaluated precedential nuances, potential impacts of decisions, and the level of public sympathy/appeal/credibility of plaintiffs does not show that Marshall’s selection of cases was subjective. One can use objective criteria to evaluate all of these things. The passage does not tell us enough about the way in which Marshall chose cases to support the characterization that his decision process was subjective.