The biggest objections to the printing press came from the organizations in power. why would those in power by threatened by the spread of knowledge (reformation)

Because it took them a couple months to make a book, normally.

When the printing press was made, it took about two weeks to make a book.

The people in power had controll over what was in the books and what was taught. But when the printing press was made, they didn't have controll like they wanted (also, books where made at a faster pace) so the high up ( the people in power) wanted to get rid of the printing press.

Hope this helps!

a.   it resulted in widespread unemployment.

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)