Final answer:
Laurie most likely has Down syndrome, which is generally indicated by an IQ range of 40-70 and characterized by small hands and feet, a flat face, and eyes that slant upward. Down syndrome is associated with a 47, XY, +21 chromosomal pattern and also includes a predisposition to other medical conditions.
Step-by-step explanation:
Laurie, who has small hands and feet, a flat face, and upwards slanting eyes, most likely has a condition called Down syndrome. People with Down syndrome usually have a chromosomal pattern known as 47, XY, +21, which can lead to a range of intellectual and physical characteristics. The most common intellectual developmental disorder associated with Down syndrome results in an IQ typically ranging from 40-70. These features and the IQ range mentioned align with option (a) Down; 40-70.
As the majority of the population has an IQ score between 85 and 115, a person scoring around 70, as mentioned in the referenced material, may be diagnosed with an intellectual disability (ID) if there are also major deficits in adaptive functioning, and these were present before the age of 18. Down syndrome often includes other health concerns such as vision problems and congenital heart disease, but the societal view on raising individuals with Down syndrome has been evolving positively over time.