Final answer:
The relationship between radius and mass can vary depending on the context. In the case of gravitational force between two objects, mass is directly proportional to radius. However, in other cases, the relationship may vary.
Step-by-step explanation:
The relationship between radius and mass depends on the context in physics. For gravitational force between two objects, the mass of an object is directly proportional to its radius. So, as the radius increases, the mass of the object also increases (Option A). However, there may be other cases where the relationship between mass and radius varies depending on the specific object or material in question (Option D). It is important to consider the specific context and physical properties involved.