If the unresponsive victim has difficulty breathing, place the victim:

When dealing with unresponsive victim that has difficulty breathing, place the victim in a modified H.A.IN.E.S position. This is a recovery position that give better alternative airway and spinal protection for the unconscious casualty. The position is known to reduce the amount of side-ways movement of head and neck. In addition, H.A.IN.E.S means high arm in endangered spine.

Option C

Explanation:

It is believed by the scientist that microscopic marine plant known as phytoplankton have contributed nearly  85 percent of the oxygen to Earth’s atmosphere.

This is so because phytoplanktons have the ability to photosynthesize in the same manner as plants on land to produce oxygen.  

Hence, it can be said that when sunlight  penetrate the marine ecosystem and interact with the  phytoplanktons, it lead to production of oxygen.

Hence, option C is correct.