A is the answer
The two reactive elements that you should remember are Flourine (F) and Francium (Fr), and only F is first for one answer.
Ionic solids are formed as a result of transfer of electrons from one atom to another resulting to ionic bond between the ions formed. Ionic solids therefore contains an ordered array of mono atomic or polyatomic ions held together by ionic bonds. Example is Solid sodium Chloride (NaCl).
Follicle cells in your scalp assemble proteins to build new hair. This most likely involves dehydration synthesis reactions.
Dehydration synthesis forms a peptide bond between amino acids and releases a water molecule. Amino acids connected via peptide bonds form a polypeptide chain, which then chemically interact with other polypeptides in order to create a complex three-dimensional structure of the protein.
That would be the chloroplast.