Final answer:
Mary, Queen of Scots, cousin to Queen Elizabeth, aimed to take the English crown and reestablish Catholicism but was executed for treason in 1587.The correct option is a).
Step-by-step explanation:
The cousin of Queen Elizabeth who aspired to take the throne of England and return the country to Catholicism was Mary, Queen of Scots. Mary was Queen Elizabeth's first cousin and part of the Stuart line. She was a devout Catholic and had issues with the Presbyterian leadership in the Church of Scotland. After plotting to take the English crown and unite England and Scotland under her rule, Mary was accused of treason. She was found guilty and was executed in 1587, which ended her ambition to alter the religious and political landscape of England by overthrowing Elizabeth, a Protestant ruler who sought to maintain a balance between Protestantism and Catholicism during her reign.
The cousin of Queen Elizabeth who aspired to take the throne of England and return the country to Catholicism was Mary, Queen of Scots. After many years of imprisonment, Mary was finally executed by Elizabeth in 1587.