Correct option (c) loosely attached organic Part
Explanation :
Coeozyme / cofactors are organrc substances (often vitamins) which are loosely attached with apoenzymes. A holoenzyme is a conjugated enzyme. It has a proteinaceous part called apoenzyme and a non-proteinaceous part called cofactor.
Cofactor is very necessary for the activity of holoenzyme.
Cofactors can be separated from enzyme by dialysis. Cofactors may be inorganic (i.e. metal activators) or organic (i.e. coenzymes and prosthetic group).
