A physical theory states that when x = 0, the outcome y must also equal 0. A researcher fits two regression models to data:

• Model A: Standard regression $\hat{y} = 0.48x + 0.05$ with $R^2 = 0.91$
• Model B: Regression through origin $\hat{y} = 0.49x$ (forced intercept = 0) with $R^2 = 0.88$

Which model should the researcher choose?