Final answer:
If we measure an individual's self-concept at different ages, we will probably find stable tendencies.
Step-by-step explanation:
When measuring an individual's self-concept at different ages, we will probably find b) Stable tendencies if we measured their self-concept at the age of 20 and then again at the age of 30. This means that there is a consistent pattern of characteristics in an individual's self-concept over time. For example, if someone has high self-esteem at age 20, it is likely that they will still have high self-esteem at age 30.