Final answer:
A developmental scientist interested in cognition would be least likely to investigate the question C. What can explain why most people cannot remember memories before age 2?
Step-by-step explanation:
A developmental scientist interested in cognition would be least likely to investigate the question C. What can explain why most people cannot remember memories before age 2? The reason for this is that memories before age 2 are typically not accessible to conscious recall. This phenomenon is known as infantile amnesia. It is believed to be due to the immaturity of the brain structures and functions involved in memory formation during that early stage of development. So, while developmental scientists interested in cognition may study a wide range of topics related to cognitive development, the topic of infantile amnesia is less likely to be a focus of their investigations.