A Nurse Researcher Determines the Assignment of a Number to an Object

A nurse researcher determines the assignment of a number to an object for measurement by verifying what?

A) The object must vary within a narrow range to meet category requirements.
B) All objects assigned a specific measurement number must be similar to all other objects assigned the same number.
C) The objects assigned to one specific number must be positively related to the dependent variable of the study.
D) The objects assigned to one specific number must be positively related to the independent variable of the study.