Research Conducted on the Effectiveness of Pulling All-Nighters Found That

Research conducted on the effectiveness of pulling all-nighters found that students deprived of a night's sleep:

A) performed significantly better on a critical thinking task than did students allowed to sleep.
B) performed more poorly on a critical thinking task than did students allowed to sleep.
C) performed slightly better on a critical thinking task than did students allowed to sleep.
D) performed essentially the same on a critical thinking task as did students allowed to sleep.