In what way is the cell membrane like a gatekeeper? (The picture It just because I wanted to put it TwT)

The membrane is a gatekeeper as it only allows access to selected nutrients or cells, if it wants one type of nutrient to process, it will only choose that nutrient!

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The cell membrane controls how materials move into or out of a cell, just like a gatekeeper controls the flow of traffic into and out of a parking lot. Movement of substances through a cell membrane WITHOUT using the cell's energy ; includes diffusion, osmosis, and facilitated diffusion.

Explanation: My name is Armalinda here is a google meet code pib-xywc-uaa

the answer is c. it will give up it's valence electron to the other atom.