Final answer:
Mary I pursued her goal of a Catholic succession for England by marrying Philip II of Spain. Despite their marriage, they did not produce an heir, resulting in the Protestant Elizabeth I inheriting the throne after Mary's death. so, option a is the correct answer.
Step-by-step explanation:
Mary I of England, in her quest to ensure a Catholic heir to the throne, married Philip II of Spain (A). Their marriage was part of a grander political alliance against the spread of Protestantism and was intended to unify Catholic powers. Despite this union, Mary died childless in 1558, and her half-sister, Elizabeth I, ascended to the throne, steering England back towards Protestantism. Philip II's reign saw major conflicts, including the famous defeat of the Spanish Armada by England in 1588, which solidified Protestant power in England.
Mary I of England married Philip II of Spain to have a Catholic heir.
Mary I of England hoped to have a Catholic heir who would take her throne following her death. In order to make this dream possible, she married Philip II of Spain. After Mary's death, Philip proposed to her successor, Elizabeth I, but was turned down.