The best answer is D.
A carbon sink is anything that absorbs more carbon than it produces or releases.
The main carbon sinks found in nature are plants, the ocean and soil.  Plants such as trees capture carbon dioxide from the atmosphere and use it in photosynthesis. Part of this carbon is transferred to soil as the trees and other plants die and decompose. 
Due to the effectiveness of trees and other plants as carbon sinks,  the Kyoto protocol proposed that emission reduction can be achieved through absorption of carbon dioxide by these plants. 
 
        
                    
             
        
        
        
Without wolves of course, because wolves eat deer :D
        
             
        
        
        
Smoking and drinking can cause major birth defects. It can also cause the baby to be very sick when it is born, and have a near death experience. 
depending on the amount of intake, the baby could also be born addicted to either one. It is very dangerous to drink or smoke during the development of a child.
Hope this is helpful!:))))
 
        
             
        
        
        
I’m thinking light because it doesn’t have anything to do with aquatic organisms.