Which of the following is a huge web of interconnected computer networks located all across the globe?
a. internet
b. protocol
c. tld
d. url

I would say that the most likely answer would be A. Internet.

Internet is used all around the world and is a huge web of interconnected computer networks located all across the globe. The internet is widely known to be as www (Abbreviation World Wide Web). This is what is seen in websites as the very first part of their addresses, aside from the https. 

Hope this helps. :)