Which sentence should be revised to reduce wordiness? a. this palm-sized robot has the appearance of a large motorized dragon fly . b. equipped with a video camera ,the robot in flight captures aerial views that provide a unique visual angle. c. guided by a remote control ,the robot is able to hover in a place as well as fly in all directions ,which gives flexibility d. its moveable wings allow the robots go accompany and film people or objects in motion ,so it can film the actions as it is happening.