Which of the following is most likely to cross a membrane by a non-mediated diffusion process?

Question

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Non-mediated diffusion, also known as passive diffusion, occurs when small, uncharged molecules such as gases (e.g. CO2), lipid-soluble molecules (e.g. ethanol), and water molecules can pass through a membrane without the need for a transport protein. Glucose, sodium ions, ADP, and ATP are all charged or larger molecules that require transport proteins to pass through the membrane.

Which of the Following Is Most Likely to Cross a Membrane