Question id 18 - Flight Planning and Monitoring - ATPL - Airline Transport Pilot license

Flight Planning and Monitoring - The planned flight is over a distance of 440 NM. Based on the wind charts at altitude the following components are found: FL50: -30kt, FL100: -50kt, FL180: -70kt. The Operations Manual in appendix details the aircraft's performances. Which of the following flight levels (FL) gives the best range performance:
FL 100
FL 180
Either FL 050 or FL 100
FL 050

Training tests and timed exam simulations ATPL - Airline Transport Pilot license