Which Statement Is Most Nearly Correct Regarding Time-Series Trend Models

Which statement is most nearly correct regarding time-series trend models?

A) The quadratic model is best for a series that is growing by a constant percent.
B) A linear model may yield a higher R² than a quadratic model.
C) The exponential model is rarely used for financial data.
D) The exponential model would be linear if we take the natural log of y_t.