B. by the sharing of electrons 
Answer choices A  and C are incorrect because covalent bonds form as a result of electrons (protons are kind of irrelevant). Answer choice D is incorrect because it describes an ionic bond. 
Further study topics: water polarity, hydrogen bonds, free radicals, valence electrons, and more! 
 
        
             
        
        
        
Answer:
All planets have a circular orbit with the sun at the center
 
        
                    
             
        
        
        
Answer:
Light dependent reaction and the Calvin cycle 
Explanation:
pls mark me brainliest
 
        
                    
             
        
        
        
A flow of exhaust gasses from a jet engine