It seems that you have missed the necessary options for us to answer this question so I had to look for it. Anyway, here is the answer. The term for an electorate's right <span>to vote directly for or against legislative measures is POPULAR REFERENDUM. Hope this answers your question.</span>
The spirit of Liberalism or the spirit of Unity perhaps. Both liberalism and unity among nations were at first the main post ww2 ideas but were soon abandoned with many repressive governments found especially in Eastern Europe, as well as the split of Europe into two blocks and the beginning of the cold war.
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They built new paved roads so that a greater number of dump trucks could remove the excavated earth. They sprayed insecticides to kill mosquitoes and built concrete locks to raise ships to a higher elevation.
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Your answer will be c, hope this helps :)