Final answer:
The statement about William of Orange being in line for the throne of England due to his marriage to Mary, James II's daughter, is true. Their marriage secured William's claim to the throne, leading to their joint reign after the Glorious Revolution.
Step-by-step explanation:
The statement, "Although William of Orange was married to James II's daughter, Mary, he also was in line for the throne of England," is true. William of Orange, also known as William III of England, married Mary II, daughter of King James II of England. Their marriage was not merely a union of two individuals; it had significant political implications. As a grandson of Charles I and a nephew of James II, William held a legitimate claim to the English throne.
Moreover, his marriage to Mary further strengthened his position, as she was a Protestant heir to her father, who was Catholic. This held great importance in a period where religion played a pivotal role in politics. Eventually, William and Mary were offered the throne by Parliament, leading to the Glorious Revolution where James II was deposed. This marked William and Mary's joint reign over England, Scotland, and Ireland as co-monarchs.