Help asap need answer in 5 minutes and please don’t take advantage of the points

What was the overall impact of eli whitneys introduction of interchangeable parts?

The telegraph, the transatlantic telegraph cable, and the telephone were important to businesses after 1850 because of a. they created a system for developing new inventions. b. they filled a need that other inventions of the day could not. c. they attracted investors and created the stock market. d. they made picture-taking a popular american pastime.

What's the main idea of document 4 in "how democratic was andrew jackson? "