Which of the following best describes a decision made based on individual whim or preference?

The term that best describes a decision made based on individual whim or preference is "arbitrary." When a decision is labeled as arbitrary, it signifies a lack of consistent reasoning or logic behind it, often reflecting personal feelings or spontaneous choices rather than a systematic or structured thought process. This can include decisions that seem random or capricious, highlighting that they are often influenced by personal desires rather than objective criteria.

A calculated decision involves careful consideration and analysis of various factors, leading to a logical conclusion. A rational decision is marked by reason and sound judgment, typically based on a coherent set of principles. A purposeful decision is made with a specific goal or intention in mind, indicating a focused direction rather than the randomness associated with whim. In contrast, an arbitrary decision does not adhere to a clear rationale, aligning it more closely with individual quirks or moments of spontaneity.