The correct answer is B. rough enoplasmatic reticulum
Endoplasmatic reticulum is a cell organelle that is formed by several cisterns, vacuoles and tubes. There are two types of the endoplasmatic reticulum, rough ( granulated) and smooth (ungranulated). The main difference between the two is that the rough endoplasmatic reiculum has ribosomes on the outer layer (hence the name, rough). The rimosomes on the outer layer enable endoplasmatic reticulum of this type to produce protein, as ribosomes are essential structures in protein production.