Final answer:
The organelle plasma cells have in abundance to enable them to secrete antibodies is the rough endoplasmic reticulum, since it's responsible for protein synthesis and processing the correct option is B).
Step-by-step explanation:
Plasma cells are key to the immune response due to their role in secreting antibodies, which are made of protein. Since antibodies are proteins, the membrane-enclosed cell organelle one would expect plasma cells to have in abundance is the rough endoplasmic reticulum (RER).
The RER's function is to synthesize and process proteins, and plasma cells are packed with it to manage the high demand for antibody production. Plasma cells are differentiated B cells that function as antibody factories, thereby requiring an extensive network of RER for their function.
This makes rough endoplasmic reticulum the correct organelle associated with plasma cells in comparison to mitochondria, smooth endoplasmic reticulum, lysosomes, or centrioles which serve different cellular functions.