Determine whether the following statements are True $(T)$ or False $(F)$:
$(a)$ Transition elements exhibit variable oxidation states.
$(b)$ The $E^o$ values for $Mn, Zn,$ and $Ni$ are more positive than expected from the general trend.
$(c)$ Any metal exhibits its maximum high oxidation state in oxide and chloride compounds.

• A
  $(a) T, (b) T, (c) T$
• B
  $(a) T, (b) F, (c) T$
• C
  $(a) T, (b) T, (c) F$
• D
  $(a) F, (b) T, (c) T$