Final answer:
The correct answer is C) Only statements 1 and 2 are correct, as individuals do differ in values development, hold different values at different stages, but do indeed change their value priorities even after reaching adulthood.
Step-by-step explanation:
The question asks which of the following statements are correct concerning values and their development: (1) individuals differ in their level of values development, (2) individuals hold different sets of instrumental values at different stages of development, and (3) peoples' value priorities do not change once they become adults. The correct answer to this question is: C) Only statements 1 and 2 are correct.
It is widely acknowledged in social science that individuals develop values over time, and these values can evolve based on experiences and reflection (statement 1). Additionally, the sets of values or instrumental values that individuals hold can indeed differ as they pass through different stages of development, reflecting a progression of moral and personal understandings that change with age and social context (statement 2).
However, the notion that individuals' value priorities are fixed once they become adults (statement 3) is flawed. Research and observations in social behavior indicate that value priorities can and often do change throughout adulthood in response to new life experiences, challenges, and contexts.