Measurement of Cmos Parasitic capacitors
Some capacitances are (roughly) proportional to the gate width, some to the gate length, and some to the gate area. The question is asking you to figure out how \$C_{gs}\$ and \$C_{sb}\$ will change as the physical dimensions change.

Basically, the question is asking whether you know what these capacitances really mean and where they exist in the physical device.