The C in an A-B-C-B Single-Case Experimental Design Refers to

Multiple Choice

The C in an A-B-C-B single-case experimental design refers to

A) an additional dependent variable added, then removed, part way through the treatment period.
B) adding a no-treatment period to compensate for the effect of an unstable initial baseline.
C) using multiple baselines so that having a reversal period is unnecessary.
D) adding an additional control condition to rule out alternative explanations for the effect of the independent variable.