Answer:
Increase by a factor of 1,000
Explanation:
As a cell increases in size, there is also a corresponding increase in the surface area and volume. It is however important to note that the volume increases faster than the surface area.
Since it was said that the surface area increased by a factor of 100 and knowing that volume increases factor, the increase in the factor of the volume must be higher than 100. The only option which has a higher factor is the increase by a factor of 1000 which is the right choice.