A 2.05 m aqueous solution of an unknown solute has a boiling point of 102.1°C. The boiling point elevation constant, Kb, for water is 0.512°C/m. Which one of the following could be the unknown compound?
a) Glucose (C₆H₁₂O₆)
b) Sodium chloride (NaCl)
c) Ethanol (C₂H₅OH)
d) Sucrose (C₁₂H₂₂O₁₁)