In deciding what to measure in a singlecase experiment it is

In deciding what to measure in a single-case experiment, it is usually best to...?

A. pick something implied by how the clinical goal was operationally defined.
B. measure more than one thing.
C. choose a behavior that is more frequent over one that occurs very rarely.
D. all of the above.

Single case designs are aset of methods in which each participant serves as his or her own control.

C. choose a behavior that is more frequent over one that occurs very rarely.