Final answer:
Option (B), The endomembrane system includes the nuclear envelope, lysosomes, vesicles, the ER, Golgi apparatus, and sometimes the plasma membrane; however, it does not include the mitochondria.
Step-by-step explanation:
The endomembrane system includes several cellular components that work together to modify, package, tag, and transport proteins and lipids that form the membranes. It comprises the nuclear envelope, lysosomes, vesicles, the endoplasmic reticulum (ER), and Golgi apparatus.
Additionally, the plasma membrane is sometimes considered part of this system due to its interaction with other endomembranous organelles. The component not included in the endomembrane system is B. Mitochondria.