If you want to generate a nearly exhaustive list of the different ...

[bclement10]

If you want to generate a nearly exhaustive list of the different approaches taken by various researchers in studying the same topic, you would
 
  a. operationally define the terms you are interested in.
  b. create an extensive list of hypothetical constructs
  c. carry out a literature search of published research.
  d. attend conference presentations about the research you are interested in.

Question 2

A literature search allows researchers to
 
  a. take concrete ideas and operationalize them in complex ways.
  b. avoid doing research on difficult topics that others have pursued.
  c. guarantee that they use probability sampling.
  d. see the different approaches used by other researchers.

[lauravaras]

Answer to Question 1

c

Answer to Question 2

d

[bclement10]

Excellent

[Jossy]

Gracias!