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# The relative lowering of vapour pressure is equal to the molar fraction.This law is known as

$\begin{array}{1 1}(a)\;\text{Henry's law}\\(b)\;\text{Ostwald's dilution law}\\(c)\;\text{Van't haff law}\\(d)\;\text{Raoult's law}\end{array}$

This is the definition of Raoult's law.
Hence (d) is the correct answer.