Does the Size of a Planet or Moon Influence Its

Does the size of a planet or moon influence its magnetic field?

A) No, bodies of all sizes are equally likely to possess magnetic fields.
B) Yes, large bodies are more likely to spin faster and are thus more likely to possess a magnetic field.
C) Yes, large bodies retain their internal heat longer, are more likely to have a molten core, and are thus more likely to have a magnetic field.
D) Yes, the oblateness (being thicker through the equator than through the poles) influences the formation of a magnetic field, and large planets are more oblate.