If the gross margin for rails is decreased to $$$$,$ can you predict what the optimal solution and profit will$$ be$?$ Select the correct choice$$ and, if$$ necessary, fill in the answer$$ box$($es$)$ to complete your choice.

A$.$

The optimal solution might$$ change, but the values cannot be determined. The profit would change to $$$

$$

$1\mathrm{.}20.$

$($Type integers or decimals rounded to two decimal places as$$ needed.$)$

B$.$

The optimal solution would not change. The profit would$$ change, but its value cannot be determined.

C$.$

The optimal solution would not change. The profit would not change.

D$.$

The optimal solution would not change. The profit would change to $$$

$$

enter your response here.

$($Type integers or decimals rounded to two decimal places as$$ needed.$)$

E$.$

The optimal solution and profit might$$ change, but their values cannot be determined.