Answer:
<u>B. Old stone age</u>
Explanation:
I searched it online incase anyone has already answered this on here, but it wasn't answered. Soo, I saw that quizlet had your answer. 
Here:
https://quizlet.com/319105197/the-paleolithic-culture-pt-2-flash-cards/ 
<u><em>Good luck on your quiz/test!</em></u>
 
        
             
        
        
        
Well I don’t think it will effect the us unless they try to cause warfare or there trying to make a new weapon but my predictions are depending if it’s a problem for the United States nothing should happen
        
             
        
        
        
The correct answer is Sir Ernest Rutherford.
One of the first findings on atomic energy theory was reached in 1911 by Rutherford, who became known as the father of nuclear physics. 
He discovered that the mass of the atom was concentrated in its nucleus, and proposed that the nucleus has a positive charge and is surrounded by negatively charged electrons, which had been discovered in 1897 by J. J. Thomson.
His theory was complemented in 1913 by Niels Bohr, who placed the electrons in definite shells or quantum levels.