Final answer:
William of Orange was indeed married to James II's daughter, Mary, which placed him in line for the English throne. This is true and contributed to the Glorious Revolution leading to their joint reign.
Step-by-step explanation:
The statement that William of Orange was married to James II's daughter, Mary, and was also in line for the throne of England is true. William of Orange claimed the English throne as part of the Glorious Revolution, which was a turning point in English constitutional history. Mary was the Protestant heiress to her Catholic father, James II, and her marriage to William brought him closer to the English crown, eventually leading to their joint rule as William III and Mary II after the revolution in 1688.