Answer:
Structural (Ans A)
Explanation:
Structural proteins main function is maintain the structural integrity of the cell and provide mechanical support and strength. Structure proteins are Elastin, collagens (found in the skin, bones and cells) and keratins (present in hairs, nails etc.)
Structural proteins function as a transporter , this provides pathways for molecules which can not be pass through the lipid bilayer and the process is done by active and passive transport mechanism.
