Final answer:
The correct number of significant figures for the calculation 1.0250 - 0.00063 is 5.
Step-by-step explanation:
The answer to the question is C) 5.
When performing subtraction, the number of significant figures is determined by the number with the fewest decimal places. In this calculation, 1.0250 has 4 significant figures and -0.00063 has 2 significant figures. Since -0.00063 has fewer decimal places, the result will have 2 decimal places, resulting in 5 significant figures.