Answer:
C. It is uncertain whether the definition of planets will remains same in the future.
Step-by-step explanation:
The International Astronomical Union has revised the definition of the planets. The planet is considered in the new definition if it meets three conditions. It should be in the orbit around the sun, It should have sufficient mass to have hydro static equilibrium and the neighborhood should be clear. It is uncertain whether the definition will remain same in the future as there might be some different characteristics expressed by some planets and definition might be changed.