The student wants to explain an advantage of the infilling technique. Which choice most effectively uses relevant information from the notes to accomplish this goal? While researching a topic, a student has taken the following notes: Some sandstone arches in Utah's Arches National Park have been defaced by tourists' carvings. Park rangers can smooth away some carvings using power grinders. For deep carvings, power grinding is not always feasible because it can greatly alter or damage the rock. Park rangers can use an infilling technique, which involves filling in carvings with ground sandstone and a bonding agent. This technique is minimally invasive.

  1. To remove carvings from sandstone arches in Utah's Arches National Park, power grinding is not always feasible.
  2. Filling in carvings with ground sandstone and a bonding agent is less invasive than smoothing them away with a power grinder, which can greatly alter or damage the sandstone arches.
  3. Park rangers can use a power grinding technique to smooth away carvings or fill them in with ground sandstone and a bonding agent.
  4. As methods for removing carvings from sandstone, power grinding and infilling differ in their level of invasiveness.

Answer (Detailed Solution Below)

Option 2 : Filling in carvings with ground sandstone and a bonding agent is less invasive than smoothing them away with a power grinder, which can greatly alter or damage the sandstone arches.

Detailed Solution

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Choice B is the best answer. The sentence effectively explains an advantage of infilling: it's less invasive than using a power grinder. Choice A is incorrect. The sentence identifies a disadvantage of power grinding; it doesn't explain an advantage of infilling. Choice C is incorrect. The sentence identifies the two techniques park rangers use; it doesn't explain an advantage of infilling. Choice D is incorrect. The sentence indicates that power grinding and infilling are different in one aspect; it fails to explain an advantage of infilling.

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