Answer:
Endoplasmic reticulum (ER), in biology, a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells and serves multiple functions, being important particularly in the synthesis, folding, modification, and transport of proteins
I believe your answer is going to be one of thoes 4 not 109% tho u can choose one okay good
<em> believe the answer is A.</em>