An intelligence test score of 70 or below and difficulty adapting to the normal demands of life is most clearly an indication of

A) savant syndrome.
B) the Flynn effect.
C) Down syndrome.
D) intellectual disability.

Intellectual Disability

A disability characterized by significant limitations in both intellectual functioning and in adaptive behavior, which covers a range of everyday social and practical skills.

Flynn Effect

The observed substantial and long-term increase in both fluid and crystallized intelligence test scores measured in many parts of the world over the 20th century.

Savant Syndrome

A condition in which a person with significant mental disabilities demonstrates certain abilities far in excess of average.