A time-series demand estimated function with quarterly dummy variables for adjustment is shown in the following: Qt = 1,318 + 21.3t + 40.7 D1t - 3.2 D2t + 35.9 D3t , in which Q is at unit of thousand and t is the year starting 2006 t =1, 2007 t =2, …and D1t, D2t, D3t denote the dummy variables of the first, second, and third quarter in the year t.
A. In Year 2022, the period t should be equal to _______
B. What is the forecasting quantity demanded for the fourth quarter in 2022? _______
C. In each year, which quarter has the highest forecasting quantity demand? _______