A. The late start of the classes would also require significant and inconvenient changes in the timing for the administrative staff.
--> This is a "to be" and logistical requirement. Not relevant to the efficiency of night study
B. Only a few students who were high performers during their high school days when they had the habit of studying late at night volunteered.
--> Correct. This shows the experimental group was itself not unbiased. The students chosen were exceptions and
...
--> This is a "to be" and logistical requirement. Not relevant to the efficiency of night study
B. Only a few students who were high performers during their high school days when they had the habit of studying late at night volunteered.
--> Correct. This shows the experimental group was itself not unbiased. The students chosen were exceptions and
...
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