Please solve all the questions below

You have the following data: Gasoline Sales during 2017.1 to 2020.4 (in 000 of barrels) Year and quarter Gasoline Sales Year and quarter Gasoline sales 2017.1 22434 2019.1 22776 2017.2 23766 2019.2 24491 2017.3 23860 2019.3 24751 2017.4 23391 2019.4 24170 2018.1 22662 2020.1 23302 2018.2 24032 2020.2 24045 2018.3 24171 2020.3 25437 2018.4 23803 2020.4 25272 (A) Using data on gasoline sales (in thousands of barrels) from the first quarter of 2017 to the last quarter of 2020, estimate the secular linear trend equation. (B) Accordingly, forecast gasoline sales for the four quarters of 2021. (C) Use the dummy variables methods to adjust the trend forecasts for the four quarters of 2021 you made in (B) above to take the seasonal variations into account