The following text discusses theoretical physics.
String theory proposes that fundamental entities are one-dimensional vibrating strings rather than point particles. Different vibrational modes correspond to different particles. The theory requires extra spatial dimensions beyond the three we observe, typically compactified at microscopic scales. Critics note that string theory currently makes no unique predictions testable with available technology, raising questions about its status as empirical science.
Which choice best describes the function of the last sentence?
It provides mathematical equations describing string vibrations.
It introduces a methodological challenge to the theory's scientific credentials.
It summarizes the evidence supporting string theory.
It proposes experiments to test the theory's predictions.
Correct Answer: B
Choice B is the best answer. The last sentence introduces criticism about lack of unique testable predictions—a methodological challenge to string theory's scientific status.
- Evidence: The sentence states: "Critics note that string theory currently makes no unique predictions testable... raising questions about its status as empirical science."
- Reasoning: It presents a serious objection: if you can't test it, is it science?
- Conclusion: The function is to introduce a methodological challenge.
đź’ˇ Strategy: Look for "Critics note... no unique predictions... questions status."
Choice A is incorrect because equations aren't provided. Choice C is incorrect because supporting evidence isn't summarized. Choice D is incorrect because experiments aren't proposed.