Convert --→ 4.2 g = ______ kg.

Choose the best answer from the options below:
A 0.42 kg
B 0.042 kg
C 0.0042 kg
D 0.00042 kg

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To convert grams (g) to kilograms (kg), you need to divide the number of grams by 1000 since there are 1000 grams in a kilogram.

So, to convert 4.2 g to kg, you divide 4.2 by 1000:

4.2 g ÷ 1000 = 0.0042 kg

Therefore, the correct answer is C) 0.0042 kg.