Which of the Following Statements Pertaining to Randomized Block Designs

Multiple Choice

Which of the following statements pertaining to randomized block designs is false?

A) The design is appropriate when one source of extraneous variation is distorting the results of the experiment.
B) The test units within each block are likely to be less alike than units selected completely at random.
C) Similar test units are grouped together.
D) Treatments are randomly assigned to test units within each block.
E) The error mean square in a randomized block design should be smaller than if a completely randomized design was used.