_____ provide an objective description of how variables are going to be measured and observed in a particular study.

A) Independent variables
B) Operational definitions
C) External validity checks
D) Experimenter biases

Operational definitions provide an objective description of how variables are going to be measured and observed in a particular study. Independent variables refer to the variable that is being manipulated or varied in the study. External validity checks refer to the extent to which the findings of a study can be generalized to other populations or settings. Experimenter biases refer to the potential influence of the researcher's own biases or expectations on the study results.