Why are groups of small cells better than one large cell at moving material in and out?
A. They have a smaller volume.
B. They have more cell structures,
C. They have a greater surface-to-volume ratio.
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D. They have a lower surface-to-volume ratio.

C. They have a greater surface-to-volume ratio.

Explanation:

Because these smaller cells can access and pass through the membranes of the other cell membranes and permeable coverings easily and voluntarily unlike larger cells. It is also efficient for these smaller cells to penetrate and travel, delivering and transporting goods and materials such as nutrients, oxygen and waste throughout the body without consuming enough energy and conserving lesser space.

For simple reasons, they are faster, more efficient and consumes little space, and most especially depletes lesser energy. So, many small cells have more surface area than one large cell.