Answer:
A
Explanation:
The units for concentration can be g/ml (grams per milliliter)
Hence we will need to calculate the concentration for each option before making a decision:
A = 2.4 / 2 = <u>1.2 g/ml</u>
B = 2.4 / 5 = <u>0.48 g/ml</u>
C = 20 / 50 = <u>0.4 g/ml</u>
D = 30 / 150 = <u>0.2 g/ml</u>
E = 50 / 175 = <u>0.286 g/ml</u>
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Using these values, the concentration with the highest value will give us the most concentrated solution, which in this case is option A at 1.2 g/ml.