Troponin C (TnC) Exhibits All of the Following Characteristics EXCEPT

Troponin C (TnC) exhibits all of the following characteristics EXCEPT:

A) TnC has two binding sites that are always complexed to Ca²⁺.
B) the Ca²⁺ binding increases the interaction of TnC and TnI.
C) TnC has four equivalent Ca²⁺ binding sites.
D) Ca²⁺ binding to TnC decreases interaction between TnI and actin.
E) a conformational change in TnC occurs on Ca²⁺ binding.