What would be the most likely outcome for a cell if a gene expressed at relatively constant but low levels were mutated to dynamically respond to environmental changes?

A)The cell could experience an ideal balance of proteins that might affect cellular function.
B)The cell would not be affected because no protein changes would occur.
C)The cell would experience increased function because having more of a protein is always an improvement.
D)The cell would likely have more and less protein at different times that would affect cellular function.