Question: The table below shows the regression output with sales as the dependent variable and advertising expenditure ($) and time period, t (year) as the independent

The table below shows the regression output with sales as the dependent variable and advertising expenditure ($) and time period, t (year) as the independent variables. What is the correct interpretation of the slope coefficient time period?

the sales is estimated to increase by 18120.3 for a one year increase in the time period.

After controlling for the effect of time period, the sales is estimated to decrease by 0.06 for a dollar increase in the advertising exp.

After controlling for the effect of advertising exp, the sales is estimated to increase by 31232.5 for a one year increase in the time period.

After controlling for the effect of advertising exp, the sales is estimated to increase by 18120.3 for a one year increase in the time period.

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