Industrial enterprises grew to unprecedented sizes in the late nineteenth and early twentieth ...

Industrial enterprises grew to unprecedented sizes in the late nineteenth and early twentieth centuries, partly because __________.
 
  a. markets were being closed all over the world
  b. new technologies required huge levels of investment and manpower
  c. the American economy became isolated and primarily domestic
  d. the government required new enterprises to have at least a hundred employees

Question -2-

If findings from a random sample of 1,500 people have a 95 percent chance of accurately reflecting the views of the whole population within 3 percentage points, what percentage of the overall population would favor changing voting day from Tuesday to
 
  Sunday if the poll found that 57 percent of those polled favored the change?
 
  a. 54 percent
  b. 57 percent
  c. 60 percent
  d. 54 to 60 percent