Scientists Have Used DNA Sequencing Data in Developing a Theory

Scientists have used DNA sequencing data in developing a theory of evolution of cell structures such as mitochondria and chloroplasts, but they have not used this type of data in the same way for developing a theory of evolution of the endomembrane system.Which statement provides a viable reason to explain this difference?

A) The endomembrane system is more complex in structure than either mitochondria or chloroplasts and therefore requires a different experimental approach for analyzing its origins.
B) The endomembrane system likely evolved over a very long time period, whereas mitochondria and chloroplasts likely originated as the result of a small number of events over a much shorter time.
C) The endomembrane system is thought to have evolved via folding of the cell membrane and is therefore not like mitochondria and chloroplasts, which contain DNA and likely evolved from prokaryotic cells.
D) The endomembrane system evolved before mitochondria and chloroplasts evolved, and any evidence of its evolution that might have been found from DNA sequencing is likely to be gone.
E) The endomembrane system is quite extensive, occupying a very large surface area within a single cell, which makes it difficult to use any experimental technique to analyze its evolutionary origins.