The advantage of RBCs being biconcave is that

They increase the surface area.

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They can be packed up like coins.

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They can fit into capillaries.

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None of the above.

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Solution

The correct option is A They increase the surface area.
The advantage of red blood cells being biconcave in shape is that the surface area is increased to allow more haemoglobin to be stored in the cell. This means that the red blood cells can acquire a greater volume of oxygen than if they had a flatter membrane.
Thus, the correct answer is option A.

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