Final answer:
The claim that William of Orange was married to James II's daughter Mary and was in the succession line for the English throne is true. They ruled jointly as William III and Mary II after the Glorious Revolution.
Step-by-step explanation:
The statement that William of Orange was married to James II's daughter, Mary, and he was also in line for the throne of England is true. William of Orange became William III of England. He ruled jointly with his wife, Mary II, after they were offered the throne by Parliament, an event known as the Glorious Revolution. They were both Protestants, a key factor in the Protestant-controlled Parliament's decision to offer them the throne, bypassing James’s Catholic son.