The following text is about materials science.
Graphene, a single layer of carbon atoms arranged in a honeycomb pattern, is the strongest material ever measured—about 200 times stronger than steel. It also conducts electricity better than copper and is nearly transparent. Scientists envision applications ranging from flexible electronic displays to stronger building materials. However, manufacturing graphene at industrial scales while maintaining its extraordinary properties remains challenging. Until production methods improve, graphene's remarkable potential will largely remain in laboratories.
What does the text identify as graphene's main limitation?
It is weaker than other materials
It cannot conduct electricity
Producing it at scale while preserving its properties is difficult
Scientists do not understand its structure
Correct Answer: C
Choice C is the correct answer. The text states "manufacturing graphene at industrial scales while maintaining its extraordinary properties remains challenging."
- Evidence: Scale production while maintaining properties is the problem.
- Reasoning: Lab success hasn't translated to industrial production.
- Conclusion: Manufacturing at scale is the limitation.
Choice A is incorrect because it's "200 times stronger than steel." Choice B is incorrect because it "conducts electricity better than copper." Choice D is incorrect because its structure (honeycomb pattern) is understood.