The question stem asks which answer choice best completes the passage. Do not bother breaking the passage into its conclusion, premise, and assumption for inference questions. Instead, focus on what the passage states directly. The correct answer must be true based on the facts in the passage. The passage states that the committee...recommended imposing quality standards for the materials used to make sports equipment, even if specific types of injuries could not be blamed on a particular material's flaw. However, it seeks to avoid placing needless and costly limitations on sports equipment manufacturers.
The question asks how the passage may be best completed. The correct answer will logically complete the passage. For example, if the injuries in question are not caused by the materials, then placing the needless and costly limitations on sports equipment manufacturers would not be necessary. Therefore, it would be valuable to establish that a material's flaw causes injuries. Evaluate the answer choices looking for one that reflects this idea.
Choice A: While it is implied in the passage that the quality standards are possible to enforce, this is out of scope. Whether the standards are possible to enforce is not something that is necessary to establish to make sure there is not needless and costly limitations on sports equipment manufacturers.
Choice B: Correct. If the flaws in the material do not actually lead to sports injuries, then creating quality standards is needless. Therefore, establishing that material flaws actually cause injuries is necessary information and logically completes the passage.
Choice C: No. Whether the members of the committee would themselves be affected by the new standards is out of scope. The passage is concerned with sports injuries as a whole, regardless of who the injuries affect.
Choice D: No. The fact that the materials being regulated are used exclusively in sports equipment is out of scope. Any other use of the material is irrelevant to whether or not setting quality standards for the material is necessary.
Choice E: No. Whether or not sports injuries caused by flaws in the materials are less severe than other types of injuries is out of scope. The passage is not concerned with comparing the severity of the injuries. The passage is only concerned with if deciding to impose quality standards on the material is needless.
The correct answer is choice B.