The answer is b. the mutation remains with the cell and is passed on in division.
Mutations occur on DNA molecules, so the mutation cannot become part of the protein nor the protein can be substituted with a mutation. Once a mutation happens it remains with the cell unless it is detected by cellular mechanism and fixed. If cell does not detect the mutation, it will not be fixed and the mutation will remain forever with the cell. In the normal process of mitosis (cell division), it will be passed down to the next generation of cells.
