The correct answer is:
D. very high population growth.
Explanation:
Struggling countries typically had lower Gross national product. Which mean the high population growth would not be accompanied by the development of wealth. This regularly compared with an increase in unemployment and starvation all across the country.
John Dalton, J.J. Thompson, Ernest Rutherford, Niels Bohr, James Chadwick and Ernest Schrodinger each contributed greatly to the modern atomic theory by finding the actual evidence.