The correct option is:
B) lipid
Explanation:
A lipid is a biomolecule that is solvable in nonpolar solvents. Non-polar solvents are typically hydrocarbons used to melt another naturally happening hydrocarbon is.Any of a large group of organic mixtures that are oily to the touch and difficult in water. Lipids comprise fatty acids, oils, waxes, sterols, and triglycerides. They are a source of stored energy and are an element of cell membranes.
 
        
                    
             
        
        
        
Skeleton is what the connective tissue uses to stay part of the body. Without the skeletal system we wouldn't be able to move our muscles.
 
        
             
        
        
        
One negative side effect of with anaerobic synthesis of energy is that a by product of glycolysis is lactic acid
lactic acid cause muscle fatigue and post exercise  muscle soreness. when you exercise the body uses oxygen to break down glucose for energy. when one do intensive exercise, oxygen may not be enough therefore lactic acid is produced.
 
        
                    
             
        
        
        
Search on google or google asl or yahoo ask