Options are not provided in the question, so the complete question is as follows:
In the three domain system, the domain Eukarya consists of all organisms that have which of the following?
A. Contractile vacuole
B. Nucleus
C. Chloroplast
Answer:
B. Nucleus
Step-by-step explanation:
The three domain system include archaea, bacteria, and eukarya.
Eukarya, consists of all organisms whose cells have a nucleus. Eukarya contains multicellular and visible organisms, such as animals, people, plants and trees.
Bacteria and arachaea contains unicellular organisms and lack a nucleus.
Hence, the correct option is B. Nucleus.