Answer:
I say D because ribosomes make proteins and the endoplasmic reticulum does transport things around the cell
Explanation:
a is not it because as i said proteins are made in the ribosomes not the nucleus
c is not it because lysosomes get rid of any unwanted germs bacteria or viruses that enter the cell
b is not it because well um im not sure but i know the nucleus does not convert nucleic acid to amino acids
so the correct answer is definitly D
if brainiest is earned its Greatly Appreciated.