How does the presence of porins in mitochondria and chloroplasts support the endosymbiotic theory?

• A. It implies that porins are unique to eukaryotic cells.
• B. It indicates that mitochondria and chloroplasts originated from bacteria.
• C. It suggests that mitochondria and chloroplasts evolved independently from bacteria.
• D. It shows that porins are irrelevant to the evolution of mitochondria and chloroplasts.

Answer: (B)