Final answer:
The statement that William of Orange was in line for the throne of England and was married to James II's daughter, Mary, is true. They became joint monarchs after the Glorious Revolution of 1688, which emphasized the power of Parliament over the monarchy.
Step-by-step explanation:
The question asks whether it is true or false that William of Orange, who was married to James II's daughter Mary, was also in line for the throne of England. The correct answer is True. William of Orange was indeed married to Mary, the daughter of James II, and together they were in line for the English throne, which they ultimately assumed in what is known as the Glorious Revolution of 1688.
It's important to understand the historical context behind this period in English history. William III and Mary II, as they became, took the throne as joint monarchs after James II was deposed. This event was significant because it marked the transition towards a constitutional monarchy in England, with more power resting in the hands of Parliament compared to the monarchy.