The lycanthropic virus story is really nailed down," says Giles. "The epicenters that have been mapped over thousands of years a
re likely the spots where werewolves are concentrated." As it is used in this line, concentrated most nearly means Question 1 options: extracted paid attention to gathered together directed to one topic
The word "concentrated" can be used in different ways, be it a verb or an adjective. Its use depends on the need and requirement of the sentence.
As seen in the given passage, it is used to talk about the werewolf population. Considering the sentence form, the word "concentrated" is used as a verb. It most likely means the grouped or gathered nature of the werewolves. In other words, it is used to refer to the werewolves found together in one spot or a particular area in large numbers.