What Did the Developers of the DSM-IV-TR Seek to Accomplish

What did the developers of the DSM-IV-TR seek to accomplish when they decided that mental retardation should be coded on Axis II rather than Axis I?

A) The new coding would focus attention on the biological basis of most forms of mental retardation.
B) The Axis II coding would focus attention on the emotional problems associated with mental retardation.
C) The Axis II coding would separate mental disorders from other forms of mental disorders that tend to have environmental causes.
D) The Axis II designation would focus attention on the failure of most individuals with mental retardation to understand their disabilities.