The correct order of solutions of increasing concentration is d < c < a < b.
A solution that contains 1 mole of a substance dissolved in a volume of 1 liter is known as a 1 molar solution. You have created a 1M NaCl solution if you dissolve 58.44g of NaCl in a final volume of 1 liter.
The amount of solute that has dissolved in a specific amount of solvent or solution is measured as solution concentration. A concentrated solution is one that has a significant amount of dissolved solute in it. A diluted solution is one that has a small amount of dissolved solute in it.
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