Biology

The correct answer is: A.Endoplasmic Reticulum (ER).

Explanation:

The Endoplasmic Reticulum (ER) plays a key role in the transport of proteins. There are two types of ER:

1.Rough ER: This type of ER has ribosomes attached to its surface, where it synthesizes proteins. Once the proteins are synthesized, the rough ER helps in transporting them to other parts of the cell, particularly to the Golgi apparatus for further processing and packaging.

2.Smooth ER: While the smooth ER does not synthesize proteins, it is involved in the transport of lipids and other molecules.