A、To reduce the number of pilots on duty. B、To prevent pilots from working overtime. C、To ensure an adequate sleep for pilots. D

The Federal Aviation Administration, or FAA, the government agency that regulates civil aviation in the United States, (3)announced new rules this month to combat pilot fatigue. The new guidelines, which will go into effect in two years, call for reducing the number of pilots’ on-duty hours and giving them a 10-hour rest period between shifts, so they can get at least 8 hours of uninterrupted sleep. The new rules apply to only pilots of passenger airlines. FAA determined that including pilots who fly cargo planes—a large segment of the aviation industry—would add too much to the cost of implementing the changes. (4)But the Independent Pilots Association (IPA) has filed a lawsuit asking the government to set one level of safety for all pilots.
3. What is the main purpose of the new rules?
4. Why was IPA unhappy about the new rules?