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The weight of the eraser in milligrams is 20,000 mg.

To convert grams to milligrams, one must multiply the weight in grams by 1,000. Therefore, an eraser weighing 20 grams is equivalent to 20,000 milligrams.

A) 1.002

This option is incorrect as it significantly underestimates the weight of the eraser. Converting 20 grams to milligrams involves multiplying by 1,000, which would yield a value much larger than 1.002 milligrams.

B) 0.02

Option B is also incorrect. Like option A, it drastically underrepresents the weight of the eraser. The conversion from grams to milligrams requires multiplication by 1,000, making this value far too low.

C) 2,000

This option is incorrect as well. While it is closer than the previous options, it still does not correctly represent the weight of the eraser. The accurate conversion from 20 grams results in 20,000 milligrams, which exceeds 2,000 milligrams.

D) 20

This option is incorrect regarding the unit conversion. Although 20 grams is the original weight of the eraser, it does not reflect the weight in milligrams, which must be calculated as 20,000 mg. Therefore, while the number is correct in grams, it does not answer the question correctly.

Conclusion

The correct conversion from grams to milligrams shows that 20 grams is equal to 20,000 milligrams. All other options fail to represent this conversion accurately, either by underestimating the weight or not performing the conversion correctly. The fundamental understanding of metric conversion is crucial in determining the correct answer.