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(See the complete passage discussion here: lsat/viewtopic.php?t=50)
The correct answer choice is (E)
This question stem asks for the Main Point of the passage. If we are to prephrase this answer, the correct choice should likely allude to theories about the LHB and the emphasized need for further exploration.
Answer choice (A): While this answer choice may be consistent with the information in the passage, the main point was not simply to provide a definition of the LHB, so this choice is incorrect.
Answer choice (B): Although the stimulus provides that further evidence is needed to determine the pervasiveness of the LHB, the author never makes the assertion in this choice, so this answer should be eliminated.
Answer choice (C): While it seems that our perspective continues to grow clearer with each new piece of evidence, the author of the passage does not assert that a clear picture will emerge “soon.”
Answer choice (D): This answer choice involves the stimulus’ third theory, discussed at the end of the second paragraph, but this does not reflect the main point of the passage, so this answer choice is incorrect.
Answer choice (E): This is the correct answer choice. Although there has been new evidence uncovered which enables us to develop our understanding of the LHB, further evidence still needs to be gathered, as prephrased above.