Final answer:
Lack of early close human relations can result in developmental and social challenges for a child, leading to difficulties in adjusting to society and potential cognitive disruption.
Step-by-step explanation:
The effect of lack of early close relations with other humans on a child can result in significant developmental and social challenges. Children require nurturing social interactions to develop psychosocial skills, which are crucial for adjusting well to society. The absence of such interactions does not lead to an increase in brain cells to compensate. Instead, it can cause consequences like cognitive disruption and difficulty with socialization, as evidenced by research on isolation in rhesus monkeys by Harry and Margaret Harlow, as well as cases like the neglected child Danielle. Hence, the correct answer to the student's question is that they do not adjust well to society (D).