Answer:
The correct answer is:
c.Browse through other titles on the same shelf in the stacks
Explanation:
In a library, books are normally organized physically taking into account the Dewey Decimal Classification (DDC) that arranges books by number, alphabet in title and author. In this way, it is possible to know that normally, all the books about the same topic are placed in the same shelf or near by. Therefore, in Tay's case, it would be really probable that he will find related books to the United Nations topic close to the reference he was interested in.