The correct answer is B) Eukarya.
Fungi belong to the domain Eukarya, which is characterized by organisms that have complex cells with a nucleus. This domain includes organisms such as plants, animals, and fungi. On the other hand, Archaea and Bacteria are classified under the domain Prokaryota, consisting of simpler, single-celled organisms without a nucleus. While fungi are distinct and often mentioned separately, they are indeed part of the larger Eukarya domain due to their cellular structure and genetic makeup.