Final answer:
In NRP, arrivals should be planned and flown directly, allowing for a more optimized and efficient flight path within ATC requirements.
Step-by-step explanation:
In regards to NRP (National Route Programs), arrivals should be planned and flown using the option B) Directly. The objective of NRP is to enable operators to fly their preferred trajectory without being constrained by the fixed airway network, as long as it remains within operational and air traffic control (ATC) requirements. This usually means that flights can operate on a more optimized path, often reducing fuel burn and flight time. Arrivals should be planned to enter the terminal environment efficiently while minimizing the disruption to the existing traffic flow and ATC workload. Utilizing direct routing often corresponds with concepts like Free Route Airspace (an airspace where operators can freely plan a route between a defined entry point and a defined exit point) which enhances efficiency and reduces the environmental impact.