The vapour pressure of water at T (K) is 20 mm Hg. The following solutions are prepared at T (K)
I. 6 g of urea (molecular weight = 60) is dissolved in 178.2 g of water.
II. 0.01 mol of glucose is dissolved in 179.82 g of water.
III. 5.3 g of $\mathrm{N}{\mathrm{a}}_2\mathrm{C}{\mathrm{O}}_3$ (molecular weight = 106) is dissolved in 179.1 g of water.
Identify the correct order in which the vapour pressure of solutions increases

• Correct answer
  A

  III < I < II
• B

  II < III < I
• C

  I < II < III
• D

  I < III < II

Hence, the correct answer is option: 'A'.