For a quarterly time series over the last 3 years (Year 1, Year 2, Year 3), the following linear trend expression was estimated: = 112 + 2.3 t . The forecast for the third quarter of Year 4 is 157.2 133.9 146.5 141.9 a. 157.2 b. 133.9 c. 146.5 d. 141.9.