Some Central Banks Pursue Price Stability Before They Pursue Other

Some central banks pursue price stability before they pursue other goals.Which of the following central banks have this kind of hierarchical mandate?
I.Bank of England
Ii.Bank of Canada
Iii.European Central Bank
Iv.Federal Reserve (U.S.A. )

A) i,ii,and iv only
B) i and iii only
C) i and iv only
D) ii,iii,and iv only
E) none of the above