Final answer:
To rewrite 0.0057 with a single significant figure, you round up due to the digit '7' following the first significant digit '5', resulting in the answer D. 0.006.
Step-by-step explanation:
To rewrite 0.0057 so that it only has 1 significant figure, you need to look at the first non-zero digit in the number, which is the '5'. Following this number, the digit to its right is '7', which is greater than 5, so you would round up. The correct answer is D. 0.006.
The zero before the '5' and the zeroes between the decimal point and the '5' are not significant since they are only placeholders.
Therefore, 0.006 is the version of 0.0057 that has been rewritten with a single significant figure.