Consider the three types of investigation in psychological research written in alphabetical order : (a) Controlled laboratory experiments; (b) Ex post facto studies; and (c) Field experiments. Arrange them in descending order in terms of their ability to control secondary variance usually
1
(a), (c), (b)
2
(a), (b), (c)
3
(c), (a), (b)
4
(b), (c), (a)