In _____, the practice of flying drones for commercial purposes legally was phased in

The correct answer is A (2005).

A drone can be defined as an aircraft that does not have a human pilot. It's controlled from a ground-based controller and an automated system. Drones are commonly referred to as UAV's, that is, unmanned aerial vehicle and are commonly used for military and commercial purposes. By 2010 and 2013, business and other different countries had adopted the drone strategy with others building a variety for their benefits.The project to develop the drones started in 2002 and was completed in 2005 and then launched during the same year.