​“A Planet is a celestial body that, within a solar system is in orbit around the sun and has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium” is a:​

Correct option is D

The given definition of a planet is a theoretical definition because it explains the concept based on scientific principles and underlying theory — specifically, the physical characteristics and forces that determine what qualifies a celestial body as a planet. The definition uses scientific criteria such as orbiting the sun, mass, self-gravity, and hydrostatic equilibrium, all grounded in astronomy and astrophysics theories.

Information Booster:

1. A theoretical definition explains a term based on a scientific or conceptual framework, helping to clarify complex ideas by reference to underlying theory.

2. It often involves causal or structural characteristics that explain why the object or concept behaves or exists as it does.

3. The definition of a planet reflects modern astronomical consensus and is based on scientific observation and reasoning.

4. The definition aims to categorize celestial bodies using measurable physical properties rather than common usage or emotional appeal.

5. It differs from operational or stipulative definitions that might set terms for specific purposes without necessarily reflecting scientific consensus.   

Additional Information:

• Persuasive definition (a) attempts to influence attitudes by assigning a term a definition that evokes approval or disapproval, which is not the case here.

• Stipulative definition (b) assigns a new meaning to a term for the sake of argument or convenience but does not rely on scientific theory, unlike this example.

• Emotive definition (c) appeals to emotions or feelings rather than reason or facts, which is clearly absent in this factual, scientific explanation.