Which of the Following Describes the Most Essential Rules of Research

Which of the following describes the most essential rules of research as expressed by Kerlinger's MAXMINCON principle?

A) Researchers try to maximize error variance, minimize the systematic variance of the variables under study, and control extraneous variables.
B) Researchers try to maximize the systematic variance of the variables under study, minimize error variance, and control dependent variables.
C) Researchers try to maximize error variance, minimize the systematic variance of the variables under study, and control dependent variables.
D) Researchers try to maximize the systematic variance of the variables under study, minimize error variance, and control extraneous variables.