Final answer:
The statement about William of Orange being in line for the throne of England through marriage to Mary and being a grandchild of Charles I is true. John Locke also saw the Glorious Revolution, which brought William and Mary to power, as legitimate. The statement is a) True.
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 indeed married Mary, the Protestant daughter of the Catholic English King James II, and he was also in line for the throne.
This was not simply through his marriage, but also because he was a grandchild of Charles I, thereby being in the line of succession. William's marriage to Mary paved the way for them to jointly ascend to the English throne following the Glorious Revolution, a event that John Locke viewed as a legitimate transfer of power.
Therefore, the correct responses to the provided statements are: True for William of Orange’s claim to the throne, and also True for John Locke's support of the legitimacy of the Glorious Revolution.
Although William of Orange was married to James II's daughter, Mary, he was also in line for the throne of England. This statement is true.