Which words give the best clues to the meaning of convulsive?

What is the meaning of the word checking as it is used in this sentence from the second paragraph of the passage?

How many lynching took place in the south between 1877 and 1950

Which statement best explains the relationship between the gothic genre and the characterization in the passage? o the characterization of mr. hyde contrasts with the gloomy setting that is typical of gothic fiction. o the characterization of mr. hyde reflects the preoccupation with confined spaces in gothic fiction the characterization of mr. hyde create the cheerful mood that is typical of gothic fiction. the characterization of mr. hyde reflects the focus on horror and strong emotions in gothic fiction.