Palmer raids sacco and vanzetti boston police strike of 1919 may day riot of 1919 this list of research topics would be of most use to a student writing a paper titled a) "the first red scare." b) "causes of the great depression." c) "the rise of american labor unions." d) "the 18th amendment and prohibition."

The correct answer is A) "The First Red Scare."

The best title for a student that writes a paper on this topic would be  "The first Red Scare."

When people accuse with no arguments, just because they "suspect that...", it creates a big risk and makes a lot of damage. That is the case of the events mentioned in the question. Those incidents had the commonality of accusing people without hard facts or elements that proved they were guilty. That is why the title "The First Red Scare" is a good option for the essay. During the Red Scare, people accused other people of being Communist and that was the only thing need for being chased and prosecuted. It was a time of fear and injustice in the U.S.