Which of the following limits the maximum size of a cell? a. the stage of the cell cycle b. the ratio of cell surface area to volume c. the number of mitochondria in the cell d. the size of the organism

The answer is B. As a cell becomes bigger, the ratio of cell surface area to volume decreases.
A cell needs to import and export things according to its needs.
As a cell get's bigger, it needs to export and import more things.
However, the surface area to volume ratio gets smaller as a cell gets bigger.
In order for a large cell to import and export efficiently to meet its needs, it either cannot be large at all or must develop something that increases its surface area.

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The answer would be interphase.