Answer:
A. Golgi apparatus
Explanation:
The proteins are synthesised in the ribosomes attached to the endoplasmic reticulum.
The synthesised proteins have to be destined to perform various function sin the cells which need modification of the proteins. The organelle which provides a site for this modification is known as the Golgi apparatus.
In the given question since the protein synthesised by the ribosome differs from the protein when it becomes part of the plasma membrane, therefore, some modification like in the given case prenylation and farnesylation takes place in the Golgi apparatus.
Thus, the Golgi apparatus is correct.