Participants in an Experiment Are Shown a Series of Digits

Participants in an experiment are shown a series of digits and then asked to repeat them back a moment later. While being shown the sequence, the participants are required to say, "tah, tah, tah," out loud, over and over again. The evidence indicates that the recitation of "tah, tah, tah" will

A) have no effect on participants' memory performance.
B) provide a rhythm that helps organize participants' rehearsal of the digits, thereby improving their memory performance.
C) block participants from using their inner voice to rehearse the digits, thereby interfering with the memory task.
D) force participants to rely on the central executive rather than on a less powerful lower-level assistant, thereby improving memory performance.