I would say A. It would be difficult to find workers for jobs that people didn't desire. Like how minorities pick produce nowadays and you don't hear of white people picking produce.
a steady population of workers and the resources need to get it
JFK meant that instead of expecting change to your country what can you do to change it. <span>Kennedy's inaugural was as much a challenge to America's youth as it was a speech.</span>
Charles V, I think. I'm not certain though.