Individuals pursue their own interests but let others do the same.

A. normative age-graded influences: These are typical developmental changes tied to age (e.g., puberty, starting school), not unusual one-off events.
B. normative life events: The phrase is ambiguous; “normative life events” would imply expected experiences shared by many (not unusual), so it doesn’t match the description of rare, high-impact occurrences.
C. nonnormative life events: Nonnormative events are unexpected or unusual occurrences that have major, often unique, impacts on an individual’s life (e.g., winning a lottery, serious illness) — this matches the description.
D. normative history-graded influences: These are events that affect whole cohorts (e.g., a war, technological revolution) and apply to many people in a generation, not to unusual individual experiences.

A. egocentrism: Egocentrism is the child’s difficulty seeing others’ viewpoints; covering toys because they might be cold reflects attributing internal states to objects, not perspective-taking failure.
B. operations: Operations are internalized, reversible mental actions (Piaget); this behavior is not demonstrating logical operations.
C. animism: Animism is attributing lifelike qualities or feelings to inanimate objects (e.g., thinking a toy can feel cold), which fits this example.
D. conservation: Conservation is understanding that quantity remains the same despite changes in appearance; it’s unrelated to attributing feelings to toys.