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

tanks and submarines were easily simulated, since looking through goggles wasn’t very much different from looking through a pair of binoculars or a periscope. since the first head-mounted display was built for the pentagon in 1968, primitive versions of virtual reality have since proliferated to video arcades around the country.

which information from the excerpt best supports the inference that certain video games resulted from issues related to national security?
a. there has been a marked increase in war-themed games since the military developed conflict-based simulators.
b. there has been a marked increase in the development of new forms of entertainment since cuts to military spending have occurred.
c. there has been a marked increase in virtual reality games since the military developed conflict-based simulators.
dthere has been a marked increase in new forms of entertainment since the military’s budget was increased.