The Effects of the Carousel Apparatus Are Difficult to Interpret

Multiple Choice

The effects of the carousel apparatus are difficult to interpret because

A) it can deprive rats of only a small amount of sleep.
B) the volunteers have to sleep in wet pajamas.
C) in addition to producing sleep deprivation, it produces confounding stress.
D) it prevents microsleeps.
E) the yoked control subjects experience much more stress than do the experimental subjects.