Answer:
Examination
Explanation:
we carried out careful examination of the area.
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.
Anything you accomplish does not come with ease it's going to take hard work
The answer is servile, so D.