GMAT Critical Reasoning (CR) | Re: For years the beautiful Renaissance buildings in Palitito

Generalize:
Bldgs-damaged due to exhaust - tour buses idle
give parking-reduce damage

Any answer that supports the conclusion that providing parking will definitely reduce bldg damage is our pick. AnswerC is correct. If the buses spend less than a quarter of their time shuttling passengers then they must be idling the rest of the time. By providing parking there is absolute guarantee that the buses will be not operating/shut off for a majority of their time in Palitio.
...

---