Answer:

C. Cell Membrane

My opinion and further explanation may contains typographical and grammatical errors. Read at your own risk

Explanation:

cell/plasma membrane is the cell who provides protection of a cell (since ito iyong nag-regulate ng transport of materials na pumapasok at lumalabas na cell) .

Karen observes different cells under the microscope and notices that each cell has a structure that separates the inside of the cell from its environment. Which structure is Karen observing?

-about d'yan sa statement na ino-observe ni Karen, like what I said from the previous statement. Cell Membrane is the one who regulates the transport of material that existing, entering and exiting the cell. It's just like a displacement buddies.

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-C