The first traces of what might be called VR are described by science fiction writers in Second World War age who imagine and describe a world dominated by VR viewers and other devices. From the 60s, thanks to technological developments in the field of technological miniaturization, begin to appear the first devices (not yet viewers in the modern sense of the term) capable of to immerse the user in a virtual world. The very first is the Sensorama, dated 1962, followed in later years by prototypes developed by Ivan Sutherland with the help and collaboration of his student Bob Sproull. The correct option is D.