Among the following, what is the number of elements showing only one non-zero oxidation state?

Among the following, the number of elements showing only one non-zero oxidation state is: O,Cl,F,N,P,Sn,Tl,Na,Ti

Among the following, the number of elements showing only one non-zero oxidation state is O,Cl,F,N,P,Sn,Tl,Na and Ti.

Among the following , the number of elements showing only one non-zero oxidation state is: O,Ci,F,N,P,Sn,Tl,Na,Ti

Among the following , the number of elements showing only one non-zero oxidation state is: O,C,F,N,P,Sn,Tl,Na,Ti

Among the following elements, what is the total number of elements having the lowest oxidation state of zero? Ta b.Te c. Tc d. Ti e. TI