Which of the following factors is least likely to cause an intellectual disability?

The factor that is least likely to cause an intellectual disability is inadequate ice cream consumption. While nutrition plays an essential role in cognitive development, and poor nutrition can indeed result in various health issues, the specific consumption of ice cream is not a recognized factor in causing intellectual disabilities.

Poor nutrition in a broader context is tied to developmental disabilities, especially during critical periods of brain development, but ice cream consumption, in itself, is not linked to such outcomes. It is important to note that a balanced diet contributing to overall health is vital, but the absence of ice cream does not have a direct impact on intellectual functioning.

In contrast, a mother's drug use can have severe consequences for fetal development, potentially leading to intellectual disabilities due to exposure to harmful substances during pregnancy. Similarly, genetic abnormalities can directly disrupt normal cognitive development, making them significant risk factors for intellectual disabilities. Therefore, while nutrition is critical, the specific lack of ice cream is not relevant in this context.