Answer:
C) The mRNAs for the targeted tumor suppressor sequence are not being produced.
Explanation:
In normal cells, the product of tumor-suppressor genes, has repressive effect on the regulation of the cell cycle or even promote apoptosis and that is the way to protect the cell. If a mutation in this gene occurs, it looses its function, there is no tumor suppresor product and the cell cannot control its cycle (cell progress to cancer)
The answer would be cell membrane