Final answer:
Mary I of England earned herself the nickname of "Bloody Mary" by persecuting Protestants during her reign.
Step-by-step explanation:
The answer to the question is B) Persecuting Protestants.
Mary I of England earned herself the nickname of "Bloody Mary" by persecuting Protestants during her reign. After succeeding her brother Edward to the throne, Mary tried to restore England to Catholicism by pushing for the repeal of legislation that created the Church of England and executing several hundred Protestants. Her actions led to widespread religious persecution and earned her the infamous nickname.