The Reason Obsessive-Compulsive Personality Disorder (OCPD) Is Characterized Both by Being

The reason obsessive-compulsive personality disorder (OCPD) is characterized both by being unable to throw anything away and being obsessively clean is that

A) being unable to throw anything away describes someone low on OCPD and being obsessively clean describes someone high on OCPD.
B) the underlying cause of both of these behaviors is the same.
C) not being able to throw anything away isn't really used very often to describe someone with OCPD.
D) people high on OCPD switch off between keeping everything and being obsessively clean.