Answer:
The independent variable that uniquely explains the largest proportion of variance in the dependent variable are the variables that are easiest to change . some variables can be difficult, expensive or even impossible to change. For example considering three independent variables Time; Pressure; Temperature;
Temperature is the only independent variable among the three variables considered as the independent variable that uniquely explained the largest proportion of variance in the dependent variable.
The proportion that was uniquely explained by this independent variable is R2