Participants Are Shown a Series of Complex Shapes (That Are

Participants are shown a series of complex shapes (that are not easily named) and asked to draw them from memory after they have been taken away. Which of the following statements about this exercise is true?

A) On average, participants can correctly draw ten of the shapes from memory.
B) Participants can use the process of subvocalization to help them remember the shapes.
C) Concurrent articulation decreases performance dramatically.
D) Saying, "tah, tah, tah," out loud while doing this task should not affect performance.