Every day, the US Congress makes thousands of decisions.
In a direct Democracy, the citizenry would need to all be involved in each of these decisions. There are so many, that it would basically turn into a full time job for all citizens.
So, to allow for the majority of people to engage in trade or commerce, indirect democracy allows the election of representatives who act on behalf of the citizenry.
Industrialization used automation, technology and machinery, before products were made by hand. Prior to industrialization workers made goods by hand and individually. With industrialization workers would complete of part of the product and then assemble all the parts to make the whole.
The literacy rate would explain this well answer is A
