Gregs Groceries opened in $2021$ and carried high$-$priced, hard$-$to$-$find specialty groceries with low turnover but high markup. In $2022,$ Gregs decided to begin carrying more low$-$ to moderate$-$priced items with higher turnover but lower markup. In $2023,$ Gregs completely eliminated the high$-$priced specialty groceries. If net sales and all expenses except for cost of goods sold were equal in all three years, how did Gregs profit margins change from $2021$ to $2023?$Select answer from the options belowGregs profit margins gradually increased from $2021$ to $2023.$Gregs profit margins were highest in $2022$ but were about the same in $2021$ and $2023.$Gregs profit margins were lowest in $2022$ but were about the same in $2021$ and $2023.$Gregs profit margins gradually decreased from $2021$ to $2023.$