Final answer:
The smallest amount of a charge in something's weight that we can detect is approximately 0.01 percent.
Step-by-step explanation:
The smallest amount of a charge in something's weight that we can detect is approximately 0.01 percent (c). This means that if there is a change in the weight of an object due to the charge, it would be measurable but not observable just by looking at it, as it is a very small fraction of the total weight.