Which of the Following Is True of a Randomized AB

Multiple Choice

Which of the following is true of a randomized AB design?

A) Carryover effects can be tested by factorial analysis of variance, which provides the interaction effects of a phase with its preceding phase.
B) The possibility of carryover effects undermines the validity of the findings obtained from this design.
C) A maximum of two phases can be accommodated in this type of experimental design.
D) Data are recorded on more than one variable simultaneously and changes are identified in some of them in order to determine causality.