Which of the following regulations is considered best?

Voltage regulation in transmission and distribution systems refers to the change in voltage from no-load to full-load conditions.
It's usually expressed as a percentage.
A lower percentage voltage regulation means there's less voltage drop from no load to full load.
This is desirable because it ensures that the voltage at the customer's end remains relatively constant, regardless of the load.
Consistent voltage is important for the proper functioning of electrical equipment.
Therefore, a lower voltage regulation is considered better.
Out of the given options, 2% represents the smallest change in voltage and is thus the best.