Final answer:
The conceptual definition of 'fear of falling' is a person's belief about the risk of falling, while the operational definition is measured by the VAS-FOF score. The conceptual definition is qualitative, and the operational definition provides a quantifiable measure of the variable.
Step-by-step explanation:
The conceptual definition for the variable fear of falling refers to the qualitative or theoretical meaning of it, which doesn't rely on specific measures or instruments. Hence, the correct option representing a conceptual definition for the variable 'fear of falling' would be C. A person's apprehensive belief that he/she might fall. This addresses what fear of falling means in a broad sense, aligning with the person's beliefs and attitude toward the risk of falling.
An operational definition, on the other hand, is concerned with the precise process or method used to measure or observe the variable in a tangible and quantifiable manner. In this case, option A, the Visual Analogue Scale for the Fear of Falling Scale (VAS-FOF) score, would provide an operational definition, as it's a standardized tool used to measure the extent of an individual's fear of falling. Such scales often come with validity and reliability measures to ensure that they accurately and consistently capture the construct they are intended to measure, much like certain validity scales, such as the Lie Scale, ascertain the truthfulness of responses.