The case of Little Albert was important in the development of:

According to the principle of ecological validity,

a. experiments should be as carefully controlled as possible, in order to avoid confounding variables. b. laboratory settings should be employed whenever possible. c. behavior should be initially studied in its simplest, most basic form; more complex kinds of behavior should be studied later on. d. experiments should be conducted that will have some application to experience outside the laboratory

Circadian rhythms are controlled by a biological clock, located in a cluster of cells in the hypothalamus

Indicate whether this statement is true or false.