If We Fit a Linear Trend to 10 Observations on Time-Series

Multiple Choice

If we fit a linear trend to 10 observations on time-series data that are growing exponentially, then it is most likely that:

A) the fitted trend will be too high at t = 1 and t = 10.
B) the fitted trend will be too low in the middle.
C) the forecasts (if extrapolated) will be too low.
D) the residuals will show a pattern like - - - + + + + - - -.