What do we call any measurable conditions,events,characteristics,or behaviours that are controlled or observed in a study

A)  confounds 
B)  variables 
C)  correlations 
D)  hypotheses

Variables

Characteristics or quantities that can change or vary across individuals, situations, or time frames, often studied in research to understand patterns or causes.

Measurable Conditions

Conditions or variables that can be quantified or assessed through observation or instrumentation in a research context.