ARPANET was the precursor of the internet.
Why it is true
ARPANET was the first computer network to use the TCP/IP protocol, created in the United States in 1969 by the research agency ARPA. It was the direct precursor of the modern internet, connecting universities and research centres.
Source: Computer History Museum
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.