When You Employ a Specific Treatment Modality for a Period

When you employ a specific treatment modality for a period of six weekly sessions, using a single-subject design, you will measure:

A) the client's attitude on the variable intended to be changed
B) the variable intended to be changed
C) the variable that is intended to be changed at the beginning of each assessment and treatment session in order to compare the measurements taken during the assessment period with the measurements taken through the treatment period
D) the variable intended to be changed only once throughout the treatment period