please answer QUESTION 13 ...... also please explain all the labeled parts briefly..

Dear Student, 

The correct option is option (C).
Nuclear membrane serves the function of protecting DNA from various chemical reactions occuring in the cytoplasm, it acts as a selective barrier i.e. only a certain substances are allowed to pass and enter in the nucleus.In the given diagram, embrane is mentioned by a and c but a is plasma membrane/cell membrane whereas c is nuclear membrane.
Regards

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