The cell membranes are mainly composed of :-

Phospholipids

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Proteins

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Fats

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Carbohydrates

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Solution

The correct option is B Proteins
All living cells and many of the tiny organelles internal to cells are bounded by thin membranes. These membranes are composed primarily of phospholipids and proteins and are typically described as phospholipid bi-layers.
Hence A is the correct option.

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