An immune system cell called the plasma cell produces thousands of antibodies (a type of protein) per second for release into the body. what type of intracellular structure would you expect to be very prominent within the cell?
a. the rough endoplasmic reticulum
b. microtubules
c. the smooth endoplasmic reticulum
d. peroxisome

a. the rough endoplasmic reticulum

Because it is the site of protein synthesis.  

and all of the other organelles have no relation to protein and handling especially peroxisomes which detoxifies h202 and helps with intracellular digestion similar to the lysosomes and microtubules only function is for locomotion of prokaryotic cells and some eukaryotic cells like the sperm cell also they make up spindle fibers used to bind and separate chromosomes/chromatids in mitosis and meiosis.

the answer would be..

b. sucking