Osmotic pressure ($p$) of a solution at a constant temperature is directly proportional to its concentration $C$ (i.e., moles per litre) $C =\frac{ n }{ V }$
where $n$ is the number of moles of solute present in volume $V$ litres of solution.So osmatic pressure depends on molar mass.
Hence option $A$ and $B$ are correct, remaining does not make any sense so wrong options.
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Compound $'C'$ is
Statement $I :$ The $E ^{\circ}$ value of $Ce ^{4+} / Ce ^{3+}$ is $+1.74 \,V$
Statement $II :$ $Ce$ is more stable in $Ce ^{4+}$ state than $Ce ^{3+}$ state.
In the light of the above statements, choose the most appropriate answer from the options given below
What are $X$ and $Y$ :