The correct response is A. Only the Fe is unbalanced.
Group 1 elements since they have one outermost electron which they can give to chlorine which has 7 outermost electrons in order to form a stable compound.
Example
Pottasium (K) + Chlorine (Cl) = Potassium Chloride (KCL)
And a water molecule, this is called a dehydration synthesis. when 2 molecule combine, a water molecule leave.
