What is the correct relationship between the pHs of isomolar solutions of sodium oxide ($pH_1$ ), sodium sulphide ($pH_2$ ), sodium selenide ($pH_3$ ) and sodium telluride ($pH_4$) ?

Question

( A ) ${_pH_1}>{_pH_2}>{pH_3}>{pH_4}$
( B ) ${pH_1}<{pH_2}<{pH_3}\approx{ pH_4}$ <br/> ( C ) ${_pH_1}<{_pH_2}<{pH_3}<{pH_4}$ <br/> ( D ) ${_pH_1}>{_pH_2}\approx{pH_3}>{pH_4}$