Answer: Lin-log model.

### Explanation The correct answer is **B (Lin-log model)**. The lin-log model is a functional form of simple linear regression where only the independent variable is in logarithmic form. This distinguishes it from: - **A (Log-lin model)**: Incorrect because in this model, the dependent variable is in logarithmic form, while the independent variable is not. - **C (Log-log model)**: Incorrect because this model involves both the dependent and independent variables being in logarithmic form. The question specifies that only the independent variable is logarithmic, making the lin-log model the appropriate choice.

Author: LeetQuiz Editorial Team