The correct option is C Exploitation, habitat degradation, and pollution
People for their own profit, overexploit the different types of fish species e.g, bluefin, tuna etc. Many factories and industrial plants on the bank of sea dispose their waste directly into sea water causing the destruction of many coral habitats and pollute water and damage ecosystem. Habitat degradation, exploitation and pollution are the biggest threats to the diversity of the Mediterranean. Thus, the correct option is C.