What does 'propensity' refer to?

The term 'propensity' refers specifically to a natural inclination or tendency towards a particular behavior or action. This concept involves an inherent predisposition; for example, someone may have a propensity for kindness, indicating that they naturally tend to be kind in their actions and interactions. This definition aligns perfectly with choice A.

In contrast, the other options describe different concepts. A deep sense of fear pertains to feelings of anxiety or dread, which is unrelated to the idea of inclination. Cheerful readiness suggests an eagerness or willingness characterized by a positive attitude, again differing significantly from the notion of a tendency. Finally, a calm and composed demeanor refers to a person's emotional stability and tranquility, which does not reflect the idea of an innate tendency either. Thus, choice A is the most accurate representation of the meaning of 'propensity.'