Which of the following best describes the nature of life events?

The correct choice effectively captures the multifaceted nature of life events by acknowledging that they encompass a range of experiences that can vary significantly in their predictability. Life events can be categorized into expected occurrences, such as birthdays, graduations, and marriage, as well as unexpected events like accidents or sudden illnesses. This dual aspect highlights the complexities and uncertainties inherent in life, making the statement inclusive of diverse experiences across different age groups and circumstances.

In contrast, the other options are overly restrictive. For instance, stating that life events are predetermined and fixed does not account for the spontaneity and unpredictability of many significant moments in life. Similarly, the notion that life events always happen at specific ages fails to recognize that people may experience significant milestones at different times based on personal circumstances, cultural contexts, and societal expectations. Lastly, suggesting that life events are exclusive to adults disregards the significant milestones and experiences faced by children and adolescents, such as learning to walk, starting school, or going through puberty. Thus, the nature of life events is best described by their capacity to be both expected and unexpected.