What is the term for the smallest language unit that has meaning?

The Bruinincks-Oseretsky Test of Motor Proficiency

A. measures fine and gross motor proficiency of children from 4 to 14.5 years old B. includes both mental and motor indices C. is generally administered to "normal" infants D. is specifically for adult subjects

Marty is moody, often switching from one extreme emotion to its opposite. He wants to have close relationships but is unable to do so because he is untrusting of others. Marty is most likely suffering from ______ personality disorder

A) antisocial B) avoidant C) dependent D) borderline