Answer:
Earrings, necklaces, claw clips, bracelets, and headbands
It's are because the phrase economics is used as a plural term in the following sentence.
An abstract concept is difficult to understand because of the unspecific character that is obtained from it.
The sentence that most effectively translates the abstract concept into a mental picture is option C. (Rumors) Whispers od doubt filled the empty halls like the reek of rotten eggs.