O1 O2 O3 O4 O5 X O6 O7 O8 O9

O1 O2 O3 O4 O5 X O6 O7 O8 O9 O10 The above design is an example of a ________.

A) pretest-posttest control group design
B) time series design
C) one group pretest-posttest design
D) multiple time series design