According to economic theory, countries dependent on agriculture and allied activities ie primary sector, grow slowly and remain under-developed or developing economies. The export the raw material to the rest of the world. ... So Secondary sector is most important for the growth of and economy.
The process of electing a president changed after the elections of 1800 by the election of 1800 showing weaknesses of Article II, Section 1 of the Constitution, this instructed how the president was to be elected.
They are not being produced as fast as they are being used.
The answer is C. Hope this helps