Which of the following solutions is the most concentrated?
A. 3 liters of water with 30 grams of sugar
B. 0.1 liter of water with 1 gram of sugar
C. 2 liters of water with 0.2 gram of sugar
D. 0.5 liter of water with 50 grams of sugar
E. They all have the same concentration.
Answer: D
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