Final answer:
William of Orange's marriage to Mary II, daughter of James II, did indeed place him in line for the English throne, and they eventually ruled jointly as King and Queen of England following the Glorious Revolution.
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 became the King of England, ruling jointly with his wife, Mary II, after the Glorious Revolution, which deposed her father, James II. William's marriage to Mary and their joint reign were seen as a way to ensure a Protestant succession and to balance political power during a time of religious and political conflict in England. This arrangement is an example of how marital alliances were often used strategically in European monarchies to secure political power and claims to thrones.