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The nucleus is like the principal of a school, the cell membrane is like a school building, and the mitochondria is like the staff in a school.

Explanation:

Definitions:

The nucleus is like the principal of a school: the nucleus controls the cell, much like how the principal controls the school.

The cell membrane is like a school building: the cell membrane forms a boundary between the cell and outside environment, much like how the school building separates you from outside.

The mitochondria is like the staff in a school: the mitochondria powers the cell, much like how the staff in a school keep the school running.

the answer to your question is b