The correct option is B X: HNO3;
Y: C2H5OH;
Z: CH3COONa
Here in the Venn diagram , it is said that compound X contains only ions; compound Z has both ions and molecules and compound Y has only molecules and no ions.
We know that strong electrolytes has only ions; weak electrolytes has both ions and molecules and non-electrolytes has no ions.
Strong electrolytes: NaCl,H2SO4,NaOH,Ca(OH)2,HNO3.
Weak electrolytes: HCOOH and CH3COONa.
Non-electrolytes: C2H5OH and C6H12O6 .
Therefore, the correct answer is option C.