Significant Figures:
Significant figures, also known as significant digits, are the digits in a number that carry meaningful information. They indicate the precision or accuracy of a measurement or calculation. The rules for determining significant figures are as follows:

1. Non-zero digits are always significant. For example, in the number 123.45, all the digits (1, 2, 3, 4, and 5) are significant.

2. Zeros between non-zero digits are always significant. For example, in the number 1002, all the zeros are significant.

3. Leading zeros (zeros to the left of the first non-zero digit) are not significant. For example, in the number 0.0056, the zeros before the 5 are not significant.

4. Trailing zeros (zeros to the right of the last non-zero digit) are significant if they are after a decimal point. For example, in the number 12.300, all the zeros are significant.

Now let's determine the number of significant figures in 0.057.

Analysis:
The number 0.057 consists of three digits: 0, 5, and 7.

Since the first digit is a zero, it is not significant according to the rule mentioned above.

The remaining two digits, 5 and 7, are non-zero digits, so they are always significant.

Therefore, the number 0.057 has two significant figures.

Conclusion:
The correct answer is option A) 2 significant figures.