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To determine the number of significant figures in the number 0.000129, we follow the rules for counting significant figures:

1. Non-zero digits are always significant.
2. Any zeros between non-zero digits are significant.
3. Leading zeros are not significant because they are only placeholders.
4. Trailing zeros in a decimal number are significant.

Step-by-step process for 0.000129:

1. The leading zeros (0.000) are not counted as significant figures.
2. The digits 1, 2, and 9 are non-zero and, therefore, significant.

So, in 0.000129, the digits 1, 2, and 9 are significant.

Thus, the correct number of significant figures in 0.000129 is 3.

The correct value from the list is 3.

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