Final answer:
Cerium has four stable isotopes: Ce-136, Ce-138, Ce-140, and Ce-142, each with a different number of neutrons but the same number of protons (58).
Step-by-step explanation:
The stable naturally occurring isotopes of cerium are Ce-136, Ce-138, Ce-140, and Ce-142. Each isotope varies in the number of neutrons in the nucleus, while the atomic number (the number of protons) remains constant at 58 for cerium. Considering the provided information, all the options listed are correct and represent the isotopes of cerium.