The answer to your question is allocate because allocate is the opposite of the work appropriate :)
Answer:
Because people did not know that yellow fever was caused by the bite of an infected mosquito, they assumed incorrectly that people could catch the disease through touch. To help control the disease, letters were cleaned with vinegar before being sent. This did not work, because it was a false cause-and-effect relationship.
B.)
The 2 sentences should be turned into one because if the last sentence is left like that, it would be called a fragment/incomplete sent.
I'm not sure if there were specific answer choices but using complex words actually makes your statement rather unclear, especially assuming they are words the average person wouldn't know or understand.
I think it would be the word of heavy traffic.
