The phase diagrams for a pure solvent (solid line) and a corresponding solution (containing a nonvolatile solute and represented by the dashed lines) are shown below. 
Choose the correct option.
A = ΔTb m and B = ΔTf m
A = ΔTf m and B = ΔTb m
A = ΔTf and B = ΔTb
A = ΔTb and B = ΔTf
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