Final answer:
The number of significant figures in a measurement indicates the precision of the measurement. When quoting percentage uncertainty, it is generally recommended to use the same number of significant figures as the measurement itself.
Step-by-step explanation:
The number of significant figures in a measurement indicates the precision of the measurement. When quoting percentage uncertainty, it is generally recommended to use the same number of significant figures as the measurement itself. Therefore, the answer is (a) two significant figures.