Use reasoning to lead to the answer of the following question:
What is the largest group of books in North America?\nOptions:\n- desk\n- school house\n- library of congress\n- closet\n- classroom

library of congress
Washington D.

C has the largest library in North America.

Largest library has the largest group of books.

Library of congress has the largest group of books.

.

Final answer: library of congress