When Single-System Designs and Their Replications Are Conducted, Which of the Following

Multiple Choice

When single-system designs and their replications are conducted, which of the following practices is considered crucial

A) Substantial information about client characteristics and background should be collected.
B) Treatments should be kept uniform across cases.
C) Standardized tests rather than observation should be used.
D) Substantial information about client characteristics and background should be collected, and treatments should be kept uniform across cases.