Choose the correct statements regarding cell organelles and their inclusions.
A. The endomembrane system includes Golgi complex, endoplasmic reticulum and mitochondria.
B. Rough endoplasmic reticulum bears ribosomes on its surface.
C. Both mitochondria and plastids have circular DNA.
D. A network of microtubules, microfilaments and intermediate filaments present in the cytoplasm is called cytoskeleton.
E. Mitochondrion is a single membrane-bound structure.
Choose the correct answer from the options given below :

(D) B, C and D only
Statement A is incorrect because the endomembrane system includes the endoplasmic reticulum, Golgi complex, lysosomes, and vacuoles. Mitochondria are not part of the endomembrane system.
Statement B is correct because the rough endoplasmic reticulum bears ribosomes on its outer surface.
Statement C is correct because both mitochondria and plastids are semi-autonomous organelles that contain their own circular DNA.
Statement D is correct because the cytoskeleton is an elaborate network of proteinaceous structures, including microtubules, microfilaments, and intermediate filaments, present in the cytoplasm.
Statement E is incorrect because the mitochondrion is a double membrane-bound organelle, not single membrane-bound.
Therefore, statements B, C, and D are correct.