Answer: the correct answer is d. Iron law of oligarchy
Explanation:
The iron law of oligarchy is a political theory, first developed by the German sociologist Robert Michels in his 1911 book, Political Parties. Michels' theory states that all complex organizations, regardless of how democratic they are when started, eventually develop into oligarchies.
When air moves upwards to areas of less air pressure, clouds form.
Answer: Less important than later experiences
I think it is B. 1950's, but that is just a guess so if I'm wrong then I'm sorry
Hope this helps. :)
The easiest way to do this is to set them up as equivalent fractions, and to solve for x.

x=6