The correct option is A Mesosomes
Many functions have been suggested for the mesosomes. They are thought to increase the surface area for transporting systems of the cell. Mesosomes are often found attached to the nucleoid. It has therefore, been suggested that they play a role in the replication of DNA during cell division. They have also been found in the region of the cell membrane where the septum is formed during cell division. This indicated that they may be involved in septum formation, possible by synthesizing wall polymers.