When Designing Case Study Research, One Should

When designing case study research, one should

A) look for situations that allow for continuous assessment and provide multiple sources of information as a way of enhancing internal validity.
B) avoid manipulating an independent variable to minimizing experimenter effects.
C) try to find replication cases that are as similar as possible to the test case as a way of maximizing homogeneity.
D) try to find control cases that differ from the test case as a way of maximizing heterogeneity.