Read this excerpt from "how the internet and other technologies came about."

the pentagon wanted to ensure that their pilots would be able to fly their jets and bombers in the most unpredictable, hostile environments, including the presence of huge winds whipped up by nuclear fireballs. to accomplish this, the pentagon developed flight simulators, in what was the birth of virtual reality. the pilots would sit in chairs with goggles placed over their eyes and use joysticks to control the simulated computer image in their headset.

select the most accurate summary of kaku’s argument.

virtual reality allows people to experience harsh environments, such as nuclear warfare, in a safe location.
virtual reality began as a pentagon-generated tool that prepared jet pilots for nuclear war.
virtual reality has impressive gadgetry, such as joysticks and headsets, that were inspired by the pentagon.
virtual reality is an indispensable tool that prepares pilots for the shock of nuclear fireballs.