Explanation
Correct answer: A.
Choice A is the best answer. The sentence places Einstein’s argument within the historical context of the development of quantum theory, noting that his argument—made during the dawn of the field—conflicted with Bohr’s argument, which became the widely accepted view.
Why the other choices are wrong
Choice B
Choice B is incorrect. The sentence misrepresents information from the notes, attributing the argument that electrons had a reality independent of observation to Bohr, not Einstein. In addition, while the sentence provides the date of the conference, it doesn’t place Einstein’s argument in the context of the development of quantum theory.
Choice C
Choice C is incorrect. The sentence indicates that Einstein attended the 1927 Solvay Conference; it doesn’t identify Einstein’s argument or place it in the historical context of the development of quantum theory.
Choice D
Choice D is incorrect. The sentence explains that Einstein and Bohr had a famous debate in 1927 and that Bohr’s argument remained popular decades afterward; it doesn’t identify Einstein’s argument or place it in the context of the development of quantum theory.