Answer:
D. Engineers build a huge computer called ENIAC.
Step-by-step explanation:
ENIAC was the first general purpose computer, designed to calculate the artillery firing tables for US Army Ballistic research Laboratory. It was completed in 1945. Its first program was to check the viability of the thermonuclear weapon. Initially the press called it Giant Brain as it was capable of calculating thousand times faster than that of other electro-mechanical machines.
It is evident from the fact that it could calculate a trajectory in 30 seconds that took a human 20 hours.
It was important for world wide web as without it there wouldn't have been further improvement in computers that led to the development of world wide web.