After Estimating a Trend Model for Annual Time-Series Data, You

Multiple Choice

After estimating a trend model for annual time-series data, you obtain the following residual plot against time: The problem with your model is that

A) the cyclical component has not been accounted for.
B) the seasonal component has not been accounted for.
C) the trend component has not been accounted for.
D) the irregular component has not been accounted for.