Final answer:
The true statement is that IQ scores can change within an individual's lifetime because intelligence is influenced by both genetic and environmental factors. IQ scores are not a fixed measure and can vary due to various life factors.
Step-by-step explanation:
The true statement among the given options is b. IQ scores can change within an individual's lifetime. It's now understood that intelligence is influenced by a range of factors, both genetic and environmental. While genetic inheritance plays a role, the environment an individual is exposed to, such as resources for learning, socialization opportunities, and educational support, can significantly impact the development and expression of intelligence.
Another key aspect is that IQ scores are not a fixed measure and can change over time due to educational interventions, life experiences, and brain plasticity. IQ scores are intended to gauge certain cognitive capabilities, but they are not a comprehensive representation of an individual's innate intelligence, nor are they unaffected by factors like socioeconomic status or educational background.