The answer to your question is D (the last)
Pain in abdomen or muscles, coughing blood, fever, chills, fatigue, vomiting, etc. Google symptoms of the plague. Also if you have a history book there is probably specific symptoms they're looking for to answer this.
The major concern of scientists who left Nazi Germany for the states before ww2 was that a new Nazi would heavily persecute the Jews ,many of whom held positions in the realm of science
