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Answer: 2
To determine the number of significant figures in 0.0010, we follow a few simple rules. Leading zeros, which appear before the first non-zero digit, are not counted as significant. However, all non-zero digits are significant, and any zeros that appear after a non-zero digit and a decimal point are also significant. In this case, the three zeros before 1 are not counted, but the 1 and the trailing 0 are significant. Therefore, the number 0.0010 has 2 significant figures. The correct answer is (b) 2.